When Doofenshmirtz invents a Stinkelkrampen-Inator (aka Good Luck-Inator) to increase his chances of ruling the Tri-State Area, he inadvertently fires it at Phineas, Ferb and the gang, who end up with bad luck while preparing for a Sky Tennis match, and Candace who gets a load of luck, and thinks she has enough luck to bust her brothers.