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Parker's Pet Store is offering a dog as first prize in a fish-counting contest -- that is, the winner must determine the number of goldfish swimming in a display bowl. Beaver (Jerry Mathers) figures he's got the inside track, since Eddie Haskell (Ken Osmond) is currently working at the pet store. But in the end, Beav opts for honesty, an example that should have been followed by Lumpy Rutherford (Frank Bank), who, after being tipped off by Eddie as to the number of fish, lets slip the information to a girl named Kathy (Carol Wakefield) -- who then proceeds to tell the whole world!