Common police strategy for preventing flash mobs has been tightening of curfews. Aug. 27, 2011— -- When a massive flash mob rampaged outside the Wisconsin State Fair injuring 11 fairgoers on Aug.

Improv Everywhere is a New York-based comedy troupe known for its unexpected flash mobs. For its latest mission, the group created the “most socially distanced office” … in the middle of the East ...