4x04 Cliff's Mistake
First Aired: Oct. 15, 1987 on NBC
Summary: Cliff loses a drill of his neighbor's which has high sentimental value. Meanwhile, Theo, Vanessa, and Rudy create a haunted house in the basement.
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Dr. Heathcliff 'Cliff' Huxtable: I'm so smart I'm smarter than ME!
- The title of this episode refers to the mistake Cliff makes in losing Jeffery's power drill.