The Alphabet Chain
I know this has been done on forums before, and if it's been done here, it was way before dinosaurs walked the Earth, so here we go:
If you've never played before, I'll pick a topic, I'll start with A, and we go through the alphabet with something in that topic starting with that letter. Whoever does Z picks a new topic.
Also to cut down on post-whoring, you must wait 5-10 minutes before going again.