I got word from a colleague at a conference that my doppelgänger was afoot. Next time I went to the same conference, I met him and we took pics together. As I was watching him give his talk and he was in profile, it was really strange to feel <i>that totally looks like me up there</i>. Chilling.
One look at the picture provided convinces me that one's chances of finding one's Double, even in a see of millions of people, is probably negligibly small. Those people are not "dead ringer"s for each other.