Low Forum Frustration Tolerance (a.k.a. The Frantic Browser Reloader)
This is the guy who makes a new thread, knowing he's just written the absolutely perfect post. A post that should be heralded across the Internet for its beauty, comedy and insight. It is such a good post that the guy is checking every five seconds to see if there is a new response. If he gets a response he quickly dashes out his own reply that will appear half a second later.
If there are no responses to his perfect post then he will wait an eternity of five minutes before replying to his own thread with, "What, nobody has a comment? Helloooo???"
