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"Ask a Foolish Question" is an episode of the animated series Phineas and Ferb.


When Candace discovers that Phineas and Ferb have invented a computer that can answer anything, she asks it how she can finally bust her brothers once and for all. Meanwhile, Dr. Doofenshmirtz loses the key to his latest invention, the "All Purpose-inator," and Agent P must find it before he does.


Phineas and Ferb are sitting under the tree until Linda came by and gave them some whole-grain fat-free granola bars for them to eat. Since their mom had done all the nice things she has done for them, they decide to do something for their mom and tries to think to what to do as the Jeopardy theme plays. As their friends came by, and suggesting cleaning up the house or buying a slide rule by Isabella and Baljeet respectively, and Buford tells how they suppose to know since he's not a computer. Phineas and Ferb decide to build a Super-Computer to ask what to do for Linda. Linda goes to a new salon for a free hair style with a coupon and Candace sits on a sofa bored and wonders where Perry is. Meanwhile, Major Monogram reports to Agent P about some holes appearing throughout the Tri-State Area, and he suspects that Doofenshmirtz has something to do with it.

Then, while the computer is being made, the song "Buildin' a Supercomputer" plays, and, when they were finished building it Isabella stated it looks cute. As soon as Agent P got to Doofenshmirtz's lair, Doofenshmirtz was looking for something, and he got trapped in a quick drying cement. Later he introduced the Metal-un-Earth-inator.

The super-computer makes an initial scan of the whole Tri-State Area. They then test it by asking simple questions, and it got all of their questions correct. Finally, they asked what they should get for Linda. The super-computer said that they would have to get a gallon of industrial marking dye and a leaf blower, tie balloons onto them, and then go to the top of Danville Hill and release them exactly at 2:37 p.m. As the kids leaves, Candace goes to the backyard and sees the super-computer. She asks some questions and the super-computer answers all of them correctly. Candace plans to show this to her mom but it always disappear before she sees it. Wanting to make sure her mom sees it and remembering the super-computer, she starts giggling maniacally.

Later, Doofenshmirtz explains that the Metal-un-Earth-inator wasn't his main plan. Doofenshmirtz built it because when he was putting final touches on his All-Purpose-inator, a device that can do anything, he slipped on green paint and dropped the key that activates the All-Purpose-inator on the ground, and a gopher then took it away. As a result, he built the Metal-un-Earth-inator to attract any metal object, and annoyed that Perry was playing solitaire and not listening to him.

Back at the Flynn-Fletcher household, Candace asked the super-computer how she can make her mom see what Phineas and Ferb have done. The super-computer said that she has to build a device so her mother can see it, and stated writing down the list of items for the device. Meanwhile, Doofenshmirtz's Metal-un-Earth-inator always gets some metal helmets until it gets a chisel and a hammer which he throws back that inadvertently helps Perry escape from the dry cement. Perry and Doofenshmirtz then armed themselves with some gladiator gear and started to fight each other.

The kids concurrently released the balloons on top of Danville Hill, and then they followed them as they went home. Candace successfully built the device that was to reveal Phineas and Ferb's actions and, coincidentally, Linda comes home upset because of her awful hair do just as Candace had finished her project and brought her to the backyard. While fighting Doofenshmirtz, Perry losses his mace and throws some helmets at Doofenshmirtz, which knocks him down, and hits the Metal-un-Earth-inator which attracted the super-computer with the gopher with the key. The balloons carrying the dye and leaf blower arrives overhead and pops over Linda's head. Linda's hair looked better when the hair dye fell on it and the leaf blower dried it, which made her happy. Thus the boys' plan had been successful and Candace is annoyed that was what they did and hates computers and Phineas wonders where the super-computer went.

Doofenshmirtz picks up a sound made by the Metal-un-Earth-inator and it found the key. As he checks it, he saw the super-computer heading towards him and Perry quickly escapes. The Super-computer explodes, and Doofenshmirtz is glad he got the key but the All-Purpose-inator explodes. He starts to curse Perry, but then the roof of his building fell right on top of him and explodes. Doofenshmirtz stated that this was going to happen.




  • As in "Misperceived Monotreme," most multiple line closed captions have to be read from bottom to top instead of top to bottom.
  • In most wideshots when the super computer isn't talking, his mouth is yellow instead of green.
  • In the scene at Doofenshmirtz Evil Inc. after Candace starts to write down the list of items needed to build a contraption to bust the boys, the helmets being attracted to the Metal-Unearth-Inator are all the same design.
  • When Linda returned home, she had bags under her eyes, but after her hair becomes normal but shiny in color, the bags are gone.
  • The second time Phineas gasps, his mouth doesn't move.
  • When Buford dances his tooth switches from left to right for a couple of times.
  • Perry battles Doofenshmirtz with a mace even though he lost it when Doofenshmirtz threw it off the building, also he threw his helmet to him, but when the key appears they are both with Perry.
  • Some of the shields on Doofenshmirtz's pile appear to be wooden, making it impossible for the Metal-Unearth-Inator to have attracted them. However, they may have metal handles or screws that can't be seen.
  • When Phineas, Ferb, Buford and Baljeet release the dye and the blower. the wind turbines in the background aren't moving.
  • The supercomputer mistakenly says "my data is complete." Data is a plural noun (the singular is 'datum'), the proper grammar would be "my data are complete."
  • When the supercomputer lists the items necessary to do something nice for Phineas and Ferb's mom, it says "a gallon of industrial marking dye," yet Phineas and Ferb somehow knew to use orange marking dye. It's possible that they could only find the orange, and the computer knew this, so it didn't specify.
  • After Linda's hairdo is fixed, for some reason she has her headband on.


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Animated Productions: Phineas and FerbVideographyTake Two with Phineas and FerbPhineas and Ferb the Movie: Across the 2nd DimensionPhineas and Ferb the Movie: Candace Against the UniverseChibi Tiny Tales

Video Games: Phineas and FerbPhineas and Ferb Ride AgainDisney Channel All Star PartyPhineas and Ferb: Across the 2nd DimensionAgent P Strikes BackPhineas and Ferb: Quest for Cool StuffWhere's My Perry?Disney Infinity (2.0) (3.0) • Phineas and Ferb: Day of DoofenshmirtzWhere's My Summer?Where's My Valentine?Where's My Holiday?
Albums: Phineas and FerbPhineas and Ferb Holiday FavoritesPhineas and Ferb: Across the 1st and 2nd DimensionsPhineas and Ferb: Star Wars soundtrack
Stage shows: Phineas and Ferb: The Best LIVE Tour Ever!

Disney Parks
Agent P's World Showcase Adventure

Entertainment: Phineas and Ferb's Rockin' Rollin' Dance Party
Firework: Celebrate the Magic Parade: Move It! Shake It! MousekeDance It! Street Party

Major Characters: Phineas FlynnFerb FletcherCandace FlynnPerryDr. Heinz Doofenshmirtz

Secondary Characters: Linda Flynn-FletcherLawrence FletcherIsabella Garcia-ShapiroBaljeet TjinderBuford Van StommMajor Francis MonogramJeremy JohnsonCarl KarlStacy HiranoGinger HiranoMillyKatieHollyAdyson SweetwaterGretchenVanessa Doofenshmirtz
Recurring characters: Giant Floating Baby HeadDjango BrownColtraneCharlene DoofenshmirtzRoger DoofenshmirtzVivian Garcia-ShapiroIrvingJenny BrownSuzy Johnson Nana Shapiro• • DannyBobbi FabulousShermanMeapMitchNormClyde FlynnBetty Jo FlynnPinkyAlbertPeterKlimpaloonTalking ZebraMonty MonogramHildegard JohnsonReginald FletcherWinifred FletcherAloyse von Roddenstein
Minor Characters: JerryBigfootYetiKhaka Peu PeuThe RegurgitatorBob WebberPrincess BaldegundeMelissaUnnamed Fireside GirlsAgent EBrobotsDrill SergeantBuck BuckersonTiana WebberJack JohnsonMrs. JohnsonWendyEliza FletcherNicoletteMandyThaddeus and ThorMindyAmandaLucy FletcherAdrian FletcherBeppo BrownDr. HiranoAnnabelle JohnsonSaraBrigitte, Josette, and ColletteMishti PatelLiam McCrackenRodrigoMorgGlenda WilkinsDr. GevaarlijkHeinz Doofenshmirtz's motherBlanca DishonProfessor PoofenplotzEliza M. FeyersiedLyla LolliberryBalloony • Corn Colossus • Professor Parenthesis
Guest Characters: Santa ClausKim Possible PinocchioBaby BaboonThor OdinsonSpider-ManHulkIron ManRed SkullNick FuryVenomWhiplashMODOK

Season One: "Rollercoaster" • "Candace Loses Her Head" • "The Fast and the Phineas" • "Lawn Gnome Beach Party of Terror" • "The Magnificent Few" • "S'Winter" • "Are You My Mummy?" • "Flop Starz" • "Raging Bully" • "Lights, Candace, Action!" • "Get That Bigfoot Outta My Face!" • "Tree to Get Ready" • "It's About Time!" • "Jerk De Soleil" • "Toy to the World" • "One Good Scare Ought to Do It!" • "A Hard Day's Knight" • "I, Brobot" • "Mom's Birthday" • "Journey to the Center of Candace" • "Run Away Runway" • "I Scream, You Scream" • "It's a Mud, Mud, Mud, Mud World" • "The Ballad of Badbeard" • "Dude, We're Getting the Band Back Together" • "Ready for the Bettys" • "The Flying Fishmonger" • "Phineas and Ferb Get Busted!" • "Greece Lightning" • "Leave the Busting to Us!" • "Crack That Whip" • "The Best Lazy Day Ever" • "Boyfriend From 27,000 B.C." • "Voyage to the Bottom of Buford" • "Put That Putter Away" • "Does This Duckbill Make Me Look Fat?" • "Traffic Cam Caper" • "Bowl-R-Ama Drama" • "The Monster of Phineas-n-Ferbenstein" • "Oil on Candace" • "Unfair Science Fair" • "Unfair Science Fair Redux (Another Story)" • "Out to Launch" • "Got Game?" • "Comet Kermillian" • "Out of Toon" • "Hail Doofania!"

Season Two: "The Lake Nose Monster" • "Interview With a Platypus" • "Tip of the Day" • "Attack of the 50 Foot Sister" • "Backyard Aquarium" • "Day of the Living Gelatin" • "Elementary My Dear Stacy" • "Don't Even Blink" • "Chez Platypus" • "Perry Lays an Egg" • "Gaming the System" • "The Chronicles of Meap" • "Thaddeus and Thor" • "De Plane! De Plane!" • "Let's Take a Quiz" • "At the Car Wash" • "Oh, There You Are, Perry" • "Swiss Family Phineas" • "Hide and Seek" • "That Sinking Feeling" • "The Baljeatles" • "Vanessassary Roughness" • "No More Bunny Business" • "Spa Day" • "Phineas and Ferb's Quantum Boogaloo" • "Phineas and Ferb Musical Cliptastic Countdown" • "Bubble Boys" • "Isabella and the Temple of Sap" • "Cheer Up Candace" • "Fireside Girl Jamboree" • "The Bully Code" • "Finding Mary McGuffin" • "Picture This" • "Nerdy Dancin'" • "What Do It Do?" • "Atlantis" • "Phineas and Ferb Christmas Vacation!" • "Just Passing Through" • "Candace's Big Day" • "I Was a Middle Aged Robot" • "Suddenly Suzy" • "Undercover Carl" • "Hip Hip Parade" • "Invasion of the Ferb Snatchers" • "Ain't No Kiddie Ride" • "Not Phineas and Ferb" • "Phineas and Ferb-Busters!" • "The Lizard Whisperer" • "Robot Rodeo" • "The Beak" • "She's the Mayor" • "The Lemonade Stand" • "Phineas and Ferb Hawaiian Vacation" • "Summer Belongs to You!" • "Nerds of a Feather" • "Wizard of Odd" • "We Call it Maze" • "Ladies and Gentlemen, Meet Max Modem!" • "The Secret of Success" • "The Doof Side of the Moon" • "Split Personality" • "Brain Drain" • "Rollercoaster: The Musical!" • "Make Play" • "Candace Gets Busted"
Season Three: "The Great Indoors" • "Canderemy" • "Run, Candace, Run" • "Last Train to Bustville" • "Phineas' Birthday Clip-O-Rama!" • "The Belly of the Beast" • "Moon Farm" • "Ask a Foolish Question" • "Misperceived Monotreme" • "Candace Disconnected" • "Magic Carpet Ride" • "Bad Hair Day" • "Meatloaf Surprise" • "Phineas and Ferb Interrupted" • "A Real Boy" • "Mommy Can You Hear Me?" • "Road Trip" • "Tour de Ferb" • "Skiddley Whiffers" • "My Fair Goalie" • "Bullseye!" • "That's the Spirit" • "The Curse of Candace" • "Escape from Phineas Tower" • "Lotsa Latkes" • "Ferb Latin" • "A Phineas and Ferb Family Christmas" • "Tri-Stone Area" • "Doof Dynasty" • "Excaliferb" • "Phineas and Ferb and the Temple of Juatchadoon" • "Monster from the Id" • "Gi-Ants" • "The Remains of the Platypus" • "Mom's in the House" • "Perry the Actorpus" • "Let's Bounce" • "Bully Bromance Break Up" • "Quietest Day Ever" • "Doonkleberry Imperative" • "Meapless in Seattle" • "Delivery of Destiny" • "Buford Confidential" • "The Mom Attractor" • "Cranius Maximus" • "Agent Doof" • "Minor Monogram" • "What a Croc!" • "Sleepwalk Surprise" • "Sci-Fi Pie Fly" • "Sipping with the Enemy" • "Tri-State Treasure: Boot of Secrets" • "Doofapus" • "Norm Unleashed" • "Where's Perry?" • "Ferb TV" • "When Worlds Collide" • "What'd I Miss?" • "Road to Danville" • "This is Your Backstory" • "Blackout!"
Season Four: "For Your Ice Only " • "Happy New Year!" • "Fly On the Wall" • "Bully Bust" • "My Sweet Ride" • "Der Kinderlumper" • "Sidetracked" • "Primal Perry" • "Mind Share" • "Backyard Hodge Podge" • "Bee Day" • "Bee Story" • "Great Balls of Water" • "Where's Pinky?" • "Phineas and Ferb Musical Cliptastic Countdown Hosted by Kelly Osbourne" • "Knot My Problem" • "Just Desserts" • "La Candace-Cabra" • "Happy Birthday, Isabella" • "Love at First Byte" • "One Good Turn" • "Mission Marvel" • "Thanks But No Thanks" • "Troy Story" • "Druselsteinoween" • "Terrifying Tri-State Trilogy of Terror" • "Face Your Fear" • "Cheers for Fears" • "Steampunx" • "Just Our Luck" • "Return Policy" • "Live and Let Drive" • "Phineas and Ferb Save Summer" • "Father's Day" • "Imperfect Storm" • "The Return of the Rogue Rabbit" • "It's No Picnic" • "The Klimpaloon Ultimatum" • "Operation Crumb Cake" • "Mandace" • "Phineas and Ferb: Star Wars" • "Lost in Danville" • "The Inator Method" • "Night of the Living Pharmacists" • "Tales from the Resistance: Back to the 2nd Dimension" • "Doof 101" • "Act Your Age" • "Last Day of Summer" • "O.W.C.A. Files"

Locations at or near Danville: DanvilleSeattleMr. Slushy FranchiseDoofenshmirtz Evil IncorporatedFlynn-Fletcher HouseAtlantisGoogolplex MallOld Abandoned Amusement Park

Other: AfricaEnglandNew York CityBig BenMarsTokyoLondonChinaIndiaCanadaChileHawaii

Today is Gonna Be a Great DaySummer Belongs to YouCity of LoveJump Right InPerry the Platypus ThemePerry Saves ChristmasLet it Snow, Let it Snow, Let it SnowGitchee Gitchee GooWhere Did We Go Wrong?BustedLittle BrothersWhat'cha Doin?Carpe DiemS.I.M.P. (Squirrels In My Pants)I'm MeRollercoasterCouldn't Kick My Way Into Her HeartThe Ballad of KlimpaloonEvil for Extra CreditBackyard BeachHappy New YearGreat to Be a BabyWhat Might Have BeenSerious FunCurtain Call/Time Spent TogetherFollow the SunSilhouettes