Homer: Guys, believe me, I didn't mean to get you expelled.
Nerd 3: Oh, don't worry, Mr. Simpson, we can take care of ourselves.
[Snake appears, holding out his hand]
Snake: Uh, wallet inspector.
Nerd 1: Oh, here ya go. [All three give him their wallets] I believe
that's all in order.
Snake: Huh ho! I can't _believe_ that worked.
Homer: [realization dawning] Heyy...that's not the wallet inspector!
-- Coulda been, though, "Homer Goes to College"