I haven't even had a warning on this website so far, luckily. And I've gotten in to trouble at school, but never suspended or banned. But I'll tell you one case of censorship that pissed me off.
On Halo 3, I created a zombie gametype called Super Zomboobs. Yes, immature I know, but I didn't want to just call it Super Zombies because thats boring. Anyway, that gametype got taken off the server and I was forced to change its name because apparently it was offensive.
... Really Bungie? I can't say "boob"? ON A GAME WITH A AGE 15+ RATING?!
I changed it to Super Zombeebs, but that just doesn't sound as good. They ruined my gametype, all the fun was taken out of it!