Phil of the Future - Season 1 Episode 12

Phil's class takes a field trip to a local tomato farm, where one of the activities is to walk in a vat of tomatoes while barefoot. Phil doesn't want to go because he only has four toes. His dad makes him a prosthetic toe, which is lost in the tomatoes, then found by Keely. They have a discussion about being honest, and Phil tells her he's from the future.