Were you upset by the little Steve Irwin thing on "South Park"? Satan is giving a Halloween party, and he confronts a guy who appears to be dressed as Steve Irwin. Picture at the link -- he's walking around with the stingray stuck in his bloody chest. Satan tells him it's too soon. When it turns out it really is the dead Steve Irwin, Satan throws him out for not wearing a costume.
Dressing as Steve Irwin for Halloween actually is a pretty clever idea, and it raises the interesting question why some evil/horrible things are considered good for costumes when others aren't. We all know you can't dress as Hitler, for example, even though, in general, evil imagery is encouraged.
Hitler, by the way, appears in the new "South Park." Not as a costume, as a dead guy. And he does have a costume. He's the "Can you hear me now?" guy, with a cell phone. Don't you hate that guy?
Also pushing the evil/funny envelope: Ted Bundy, John Wayne Gacy, and Jeffrey Dahmer did an extended Three Stooges routine that was quite brilliant.