Marginally off topic,...
I've been to Disneyland countless times since I was six years old. I have probably taken over a thousand photos (a drop in the bucket compare to Darkbeer I'm sure).
I have often wondered if anyone famous is in the background of any of my vacation photos and I just don't know it. Perhaps they weren't even famous at the time. And perhaps they are just a fuzzy little dot way in the distance.
Sorry if that's too deep or bizarre a thought, but everytime I pull out old photos to look at I wonder about that. I always thought it would be fascinating to find someone recognizable "hidden" in your vacation snapshots.
(Clearly it is far too late at night as I type this and I need to go to sleep.)