Improv Everywhere is a New York-based comedy troupe known for its unexpected flash mobs. For its latest mission, the group ...

The Federal Bureau of Investigation headquarters are pictured in February in Washington, D.C. On Wednesday, the FBI's uniform crime reporting unit released its "flash mob shoplifting incident" report ...

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 ...