[HairOfTheDog]

The episode you're thinking of was when they were supposed to reveal who Cartman's father was after waiting the long break - and instead they played nothing but Terrance and Phillip doing fart jokes.

It was April Fools, and they thought everyone would be highly amused, but people got really mad! :~D

[mainepatsfan]

If I recall Comedy Central played a commercial promoting the show with actual angry phone messages they'd received from fans.

[Ladysmith]

LOL!!