I randomly stumbled upon a bunch of photos just now, from a flash mob event in London where everyone showed up at a transit station with their own music and headphones and just started dancing.
Check them out - they're pretty amazing. The guy who posted them also
wrote about the event in his blog: "...when I took off my headphones to rest and take pictures, the station was silent, quiter than it would normally be; This was because instead of talking as they moved from street to platform, commuters were watching in a state of awe. Some started talking, as I walked around the raised walkways I could overhear “what is this in aid of?”- reporter looking guy “it’s really weird, I can’t explain it”- girl on mobile phone. A lot of speculation over what was simply, just fun for funs sake."
Neat.