Kenny dies. A lot. And in violent, horrible ways.
Prior to the recent butters semen episode, there was en episode where Ms. Chokesondick dies, and the kids decide to mix semen and sea people to make a sea city. Cartman when trying to convince the clinic he's a professional taste-tests the semen and claims it's good quality. Prior to that, a guy in a back alley lets him "suck on a hose" for some.
Mr. Garrison becomes Ms. Garrison, then wants a sex change operation back, but Kyle uses his balls to create fake kneecaps when he gets a negroplasty to become a black basketball player, which burst when he tries to use them in a game. (Also, Kyle's dad gets plastic surgery to become a dolphin).
Episode where Stan's dad goes on Wheel of Fortune and guesses the N***** word when the answer was "Naggers", and the episode continues to use the word over and over throughout the remainder.
Episode where Stan's dad goes for the world record of largest $hit.
That's just off the top of my head. Tendoboy didn't think before making that comment.