Quote from : South Park: Bigger Longer & Uncut Movie

Cartman: [after seeing Kenny's ghost] Mom I saw him, I saw Kenny!
Mrs. Cartman: Oh, you poor dear! You've been through so much.
Cartman: I bet him he couldn't light a fart on fire, and now he's all pissed off
[gets shocked]
Cartman: damn I can't say "pissed off" either!
[gets shocked again]