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The Cosby Show

Episode Name: I Know That You Know
Episode Overview: When Sondra and Elvin announce their engagement, Clair and the children use the news to play a practical joke on Cliff, who launches a counter-offensive of his own. Geoffrey Owens as Elvin.
Episode Number: 21
Episode Season: 3
Episode First Aired: 1987-03-19
Rating: 8.4