A few I have on my site are:
Speak only in questions thread!
Dear Somebody, Where users write a letter to whom ever - can be serious or silly
Random Info The popularity of this thread astounds me. Its postwhoring at it's best, but a good way to eliminate worthless threads from popping up.
Meaningless Chat Convo's People are voyeurs at heart and a lot of these you get some good laughs from.
Sentances about other members Another thread that baffles as far as popularity - they make comments about other members...
Anyway - I know they arent all games, but they get posts and really, that's what it is all about.