I Know That You Know The Cosby Show : Season 3 Episode 21
TV-G NBC 30m
Aired: March 19th, 1987 @ 8:00 PM EST on NBC
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.
