Learn about the vocabulary words prove, improved, incredible, return, and notice with The Electric Company in an investigation into false advertising by a certain prankster. Marcus sees a commercial for Francine's latest invention, The Return-a-ball, a ball that is supposed to come right back to you when you throw it. He can't resist buying it, but quickly discovers that it doesn't work. The rest of The Electric Company pitches in to help Marcus prove that Francine faked her commercial so he can get his pride and his money back.