Phineas and Ferb build the ultimate lemonade stand and begin to offer franchise opportunities. Meanwhile, Candace and Stacy's relationship is put to the test when Candace feels she must pick between their friendship and busting her brothers, while Dr. Doofenshmirtz creates a "Paper-Cut-Inator" so that he can make trillions selling bandages.
While overhearing Phineas and Ferb plan their project for the day, a monorail to Mars (which was apparently chosen by Ferb after "a long-winded argument"), Candace wishes that the boys would do something normal such as building a lemonade stand or picking their nose. Ferb briefly contemplates using a nose-picking machine as Phineas wonders as to Perry's whereabouts. As Major Monogram informs Agent P that Dr. Doofenshmirtz has hoarded a large amount of paper, Stacy informs Candace that they planned to go to the mall, but Candace is too focused on attempting to bust her brothers, causing Candace and Stacy to "break up".
At Doofenshmirtz Evil Inc., Agent P arrives disguised as a plumber. Meanwhile, Candace is shocked to see Phineas and Ferb running an ordinary lemonade stand and decides to take a day off from attempting to bust them, not noticing the giant lemonade-making robot in the backyard.
Dr. Doofenshmirtz shows Agent P a newsreel explaining his latest invention, the Paper-cut-inator, which he plans to use to cause paper cuts across the Tri-State Area, forcing the populace to buy his own over-expensive bandages, making him rich in the process.Candace attempts to find someone to go to the mall with, but discovers she has no one to do so—she and Stacy are no longer friends, Jenny has other plans, she can't talk about Jeremy with Jeremy, and Mom is... well, Mom. Apparently, Buford was strangely in her contacts list as well, leading her to instantly delete him. As Isabella and the Fireside Girls start building additional lemonade stand franchises, Dr. Doofenshmirtz warms up his Paper-Cut-Inator and a despondent Candace realizes the mistake she made in losing Stacy, oblivious to the multitude of lemonade stands all around her. Candace notices both Stacy and the lemonade stands at the same time and is confused as to which she should pursue.
As the incredibly slow Paper-Cut-Inator continues to warm up, Agent P escapes from his toilet-paper prison and begins to fight Dr. Doofenshmirtz with paper. Dr. Doofenshmirtz gets stuck on a piece of flypaper, but delights that his Paper-Cut-Inator is finally active—and spits out only a single piece of pointed paper. Agent P sticks a plunger into the Paper-cut-Inator, causing the Paper-Cut-Inator to backfire and cut Dr. Doofenshmirtz, and makes his escape on a paper crane. The single piece of paper from the Paper-Cut-Inator gives the lemonade-making robot a paper cut which it spills lemon juice into, causing it pain which forces Phineas and Ferb to close their lemonade stands.
Candace is still torn between Stacy and busting her brothers, but decides to go to the mall with Stacy and ignore her brothers (at least for today) as the lemonade franchises officially close their doors. Phineas and Ferb put their "normal, mediocre kid stuff" to an end for the day while Dr. Doofenshmirtz remains trapped and covered in paper cuts—made only worse by Vanessa returning home and accidentally spilling lemonade all over her father.
- Vincent Martella as Phineas
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb
- Caroline Rhea as Mom
- Dan Povenmire as Dr. Doofenshmirtz
- Jeff "Swampy" Marsh as Major Monogram
- Alyson Stoner as Isabella and Jenny
- Dee Bradley Baker as Perry
- Kelly Hu as Stacy
- Bobby Gaylor as Buford
- Olivia Olson as Vanessa
- During the song A Better Best Friend, two of the P&F Lemonade pictures have Phineas with green hair.
- The boy in the dark green shirt (his name was confirmed to be Barry on the Game Smash) and the boy in the orange shirt with white stripes (not Phineas) are seen when Phineas and Ferb announce they're out of lemonade, and Buford's stand when they're out.
- When Stacy leans against the door in the scene where they're breaking up, her bracelet turns dark green for the whole time she does it.
- In Phineas and Ferb's line there's two of the same kid in the line with a green shirt and a black puffy hair. One in the back and front.
- When Candace is saying "They're using protractors!", they were actually using compasses.
- When they are closing down and it shows the long line of stores, all of the signs have Phineas with green hair, not red.
- When Buford is talking to Candace about friends, he says that Biff is yellow and scaly, Biff is really orange and scaly.
- When Candace was flipping through her contacts on her phone, she should have gone all have of them and it would then say 'No more contacts'. But instead, she flipped through her contacts multiple times and then only it said 'No more contacts'.
- This is the first episode that Phineas and Ferb had a long argument in planning the Big Ideas, however it was never shown.
- When Phineas and Ferb store the lemonade-making machine, the entire back yard flips over. This must mean either the boys did something that made the back yard flip in the past days of summer, or the creators ignored the fact.
- In production order, this is the 100th episode.
- Doofenshmirtz says "do not bother it is a double leaf," as he said, "do not bother, it is a double knot" in "Suddenly Suzy".
- July 17, 2010 (Disney XD Spain)
- July 20, 2010 (Disney Channel Latin America)
- July 22, 2010 (Disney XD UK)
- August 22, 2010 (Disney Channel Spain)
- September 12, 2010 (Disney XD Scandinavia)
- March 12, 2011 (Disney Channel UK)
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