I'm generally accustomed to the forum behaviors in Something Awful's FYAD-lite forums, wherein normally-unacceptable forum behaviors are considered humorous and encouraged. These include such things as multi-posting, completely unrelated non-sequiturs, burns and flames (only if actually funny), and/or allusions to previous inside jokes regarding the subject matter in places where said inside joke was not previously invoked. If I perceive the subject matter of the thread to be of a serious nature not befitting such unacceptable behavior, I tend to keep it on topic and make reasonable contributions, but really, there's room for some silliness in other places, I think.