-Shitty Nat Clones
-Randumb pre-teens
-Easily-offended newbs
-Overly-obsessive fangirls
-Overbearing mods (not a knock at anyone currently in-power)
-Forum outages(?)
-People trying to sell kitchens
-Porn spammers - bonus points for bestiality
-Drakel could easily make an appearance as a dragon

That's all I got for now. I'll post more if I think of anything else.