There are probably only two things it is not okay to joke about on these here forums. Let me make you a list!
1. Rape
2. Seriously, rape
Recently somebody not only broke this as-of-yet unwritten rule, they decided to push it when asked to stop. PROTIP YOU ARE NOT FUNNY YOU SHOULD STOP. We shouldn't have to tell you once, let alone twice, and I really don't want to get anybody b&, I'd rather they learn their lesson the easy way and stop.
Seriously, I've seen jokes on here about AIDS, cancer, murder, suicide (Kurt Cobain = hilarious), and all kinds of other things that people normally do not joke about. If you want to joke about rape, first consider suicide. Then if that doesn't work out for you, go start your own forum, and have fun when nobody wants to join because you are a douche.
THAT IS ALL.