1x35 - The New Adventures of Winnie the Pooh

Roo asks Tigger to keep him from having a bath, and the tiger recruits Piglet to switch places with Roo to trick Kanga. But when Roo and Tigger get excessively dirty, and Kanga pretends that she does not recognize Piglet, everyone realizes that their attempted "switcheroo" has gone too far. (Note: This was one of the few episodes to be directly based on a chapter from one of A. A. Milne's Pooh books, namely Winnie-The-Pooh.)