[cd34]

The trick is to put ~ ~username~ ~ in your posts (without the space between the ~ and ~).

You can do it in the title of your post, in your signature or in the body.

You could do something in the title like:

Hey ~ ~username~ ~, you're an idiot (or some other derogatory insult)

and in the body of the message you could say just kidding.

Its a real riot -- tons of fun and everyone gets a kick out of it.