Once, at DragonCon, a creepyish looking dude asked to take my photo. i was actually in a costume, so I agreed. he puts his camera on the tripod, and is fiddling with it. I'm posed and smiling since I don't always expect people to use a flash. After about 15 seconds of just standing there, and him not doing anything, I start to get suspicious that he's actually taking video and not still pictures. or maybe something else. But not actually taking pictures, as far as I can tell. So I walked the hell away as quickly as I could. Anyway, CREEPY. :/