Every once in a while, crowded train stations have been known to break into song and dance and then disperse as if nothing happened. Large groups of people freeze for a period of time and then ...

You’ve probably already heard of flash mobs–their eccentric gatherings have been well documented in media vehicles from the New York Times to Good Morning America ...

Actors dressed in beach attire participate in a flash mob as part of a commercial for McDonald’s in Chicago on July 14. The July 4 fireworks display in the Cleveland suburb of Shaker Heights was ...