Phineas and Ferb - Season 4 Episode 8 -

Doofenshmirtz hires an Outback platypus hunter who "goes rogue," forcing Perry and doctor to team up to save themselves from the boomerang-throwing maniac. Baljeet is unable to make decisions, fearing the wrong choice on even simple questions will send his life down the wrong path. Phineas and Ferb create a device that lets him see both possible outcomes of his decisions. As a side effect, it also creates a crowd of Baljeets.