Originally posted by Umbrella
You know, there's a trick to this, something that'll make him leave for sure. It's not easy, but it is possible.
The trick is for everyone to stop replying to any of his topics, which, in time, will make him bored because he's got nothing to laugh about anymore. Which will make him use his time for something else, like for instance growing up, or (more likely) becoming another forum's local spammer.

I'm sure most of you knew this and just think there's no fun in making him leave that way... But hey, just in case you didn't. ^.^
you could also change his avatar to an enoumous penis

same result, only funnier