I found this mixed up in this post:
http://www.chess.com/forum/view/general/ok-so-a-knight-and-a-bishop-walk-into-a-bar
Figured I'd single it out :D
Two people were playing a game of chess. One player's daughter takes one of the pawns and starts rubbing it with a cloth.
"What are you doing honey?" The player asks.
"I'm cweaning it daddy." she replied.