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While Beaver (Jerry Mathers) is visiting his house, Larry Mondello (Rusty Stevens) sneaks a peak at his sister's diary. Just when he's getting to the really juicy parts, he is caught in the act by his mother Mrs. Mondello (Madge Blake), who angrily scolds Larry right in front of Beaver (and yes, she threatens even direr consequences when Larry's dad "comes back from Cincinnati"). Humiliated, Larry runs away from home -- and ends up hiding out in The Beav's bathroom.