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Beaver (Jerry Mathers) is insulted that he has not been invited to a party that Wally (Tony Dow) is throwing for his friends. But instead of getting mad, he decides to get even. Visiting the local magic shop, Beaver purchases a variety of annoying practical jokes, guaranteed to make the party an event that no one will forget -- or want to remember. Perhaps it goes without saying that once Beav has all his booby-traps in place, Wally ends up inviting him after all!