There's usually a thread every 2-3 months named something along the lines of "Show us the person behind the avatar", in which your response contains a photo of you.
Correct me if I'm wrong, but for all those who respond to those particular threads (and there are usually quite a lot of responses), how are they "hiding"?
As for me, mine's a picture of 2 F-14 Tomcats. I like that picture. It use to be my background for
years before I got my first widescreen monitor, and got a widescreen background of an F-14 instead. I like it.

If you really wanna see who I am, I have a picture of me in my profile, anyway.
(Note: I just realised how aggressive this sounds at points, sorry about that. Just stating my opinion. :S )