The Cosby Show Season 3 Episode 21 I Know That You Know 1986
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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.
- Released: 1987-03-19
- Runtime: 24 minutes
- Genre: Comedy, Family
- Stars: Bill Cosby, Phylicia Rashād, Malcolm-Jamal Warner, Tempestt Bledsoe, Keshia Knight Pulliam
- Director: John Markus, Bill Cosby, Tom Werner, Carmen Finestra, Gary Kott
