PLAY BALL!

From the IMDb:
In March 2001 viewers watching reruns of the series on Nick at Nite reported that in episode 8.11 "The Charming Stranger", John Ritter's genitals could be briefly seen slipping out of his blue boxers when his character throws himself on [the] bed. Nickelodeon confirmed this goof and announced that the scene would be edited out of all future airings of that episode.

From Sitcoms Online:
Ritter told The New York Observer: "I've requested that they air both versions, edited and unedited, because sometimes you feel like a nut, and sometimes you don't."

BCnU!