Without spoiling anything I'll just state that Stick of Truth is THE South Park video game. If you have ever wanted one in your life, get the game. The comedy is by far the highlight but the gameplay is no slouch either.
@barrock: I'd say it's worth a run through. It's also probably mad cheap. I don't think there's a PS3 version though, I think it was 360 and PC only (also, the 360 version looks kinda grungy in a not-intentional way).
I think I may already own it on PC. It's just one of those games I've always said "I need to play that...". I'm curious how my 570 would handle it.