Quietest Day Ever

Quitest Day Ever is an upcoming Phineas and Ferb episode that will air March 30, 2012 on Disney Channel.

Summary
After Mom asks the kids to keep quiet while she prepares for her online knitting test, Phineas and Ferb create ninja outfits designed to hide the wearer from anyone who is not wearing them. Meanwhile, Candace becomes increasingly frustrated after she can’t find the boys and bust them. Across town, Dr. Doofenshmirtz invents the De-Handsome-Inator.

Continuity

 * The title resembles "The Best Lazy Day Ever".
 * Doofenshmirtz creates a device that will make people ugly again ("The Best Lazy Day Ever").