South Park: Season 13, Episode 4

13 - 4: Eat, Pray, Queef

Anticipating the conclusion to a Terrance and Phillip cliffhanger, the boys find a nasty April Fools joke waiting for them instead. The prank doesn't go over well, resulting in a furious Cartman and incapacitated Butters. The boys decide they must do something before it happens again.