From Matt Seigal of catshanghai.com:There was a message floating around to meet on Nanjing Dong Lu outside the Sofitel at 3pm in order to stand still for five minutes. Passers by look amused and the police appeared rather baffled. I was going to join in, but I didn’t want to pass a chance to film the event on my cellphone. The event was great fun. Hilarious! When's the next flash mob, people?......