Summary: When Sondra and Elvin stop by unexpectedly and announce their engagement plans, Cliff is the only one who doesn't know because he was at the office. So the whole family decides to pull a prank on Cliff who had been bragging that no one could pull a prank on him. But the real joke is on the family when Cliff overhears them talking and laughing about their plan.

KEYWORDS:

• The Cosby Show Season 3 Episode 21,
• The Cosby Show I Know That You Know Online,
• Watch Episode 03x21

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