you know those threads where people say "THEYRE LEAVING FOREVER HONEST"? Permaban them.
also, "they say it doesn't exist anymore, but the Hellban was an excellent concept. The Hellbanned user had no idea that he was Hellbanned, but basically he could post and post, but his posts were hidden permanently from everyone else on the forum, so he was like Bruce Willis in Sixth Sense; no one would, or could, acknowledge or reply to anything he posted." imagine it. just imagine the likes of bamnan/disintegratedmind making thread after thread, post after post... with their need for attention going unsated... :D
oh, and the ability to read through our old posts again, that was kinda cool.