Flash Mobs. Love em.

Just had this posted to my facebook wall from a friend who is a constant source of flashmob videos. I was thinking what a wonderful opportunity it would be for some street and people photography. I've never been around when its happened, probably never will be, but what an opportunity!
Symphony Flash Mob - Copenhagen Central Station

My alltime favourite, and the one I saw first of all, is this
Opera Company of Philadelphia "Flash Brindisi" at Reading Terminal Market (April 24, 2010) - YouTube