S3·E21 I Know That You Know
Core
Aired March 19, 1987
Synopsis
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.
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Frequently Asked Questions
When did Season 3 Episode 21 of The Cosby Show air?
Season 3, Episode 21 ('I Know That You Know') originally aired on March 19, 1987.
How long is Season 3 Episode 21 ('I Know That You Know')?
The episode follows the standard broadcast runtime for The Cosby Show.
What happens in The Cosby Show Season 3 Episode 21?
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....