This is sort of in the same line of thought as this topic.

Have you guys ever thought how weird it would be to discover one of your fellow posters on OT.com turned out to be someone you know in real life? I'd probably end up being someone you don't get along with on the boards at all, even though your great friends in real life.

I've always just found this as something humorous to ponder.

FRIEND: Dude, you're a Star Wars fan, should check out this forum I post at. Originaltrilogy.com, it's pretty sweet.

ME: Whoa! I am a regular there already! That is awesome! Who are you? My user name is C3PX.

FRIEND: Why you... piece of shit! You are such a jerk! All this time it's been you! I've often dreamed at night of what I'd do if I ever met that bastard C3PX in real life... now we're going to find out...

ME: Uh oh... dude, put the bat down! You don't need that! Put it--