Good troll? Yes? No?

"Hi, uhm, I'm looking for a guy who I know posts a lot on this board. I can't remember your name anymore, but I screwed around with your girl behind your back, and then you found out and all hell broke lose. It's just that I'm legally obliged to inform you that later on I found out that I'm HIV positive. ...so if you're that guy, you might want to get yourself tested."

Not bad. Probably get plenty of replies.

Jeepers, were you HIV positive from her vagina or her butthole?  Because butthole AIDS is pretty serious.