Improv Everywhere !

"Improv Everywhere is a New York City-based prank collective that causes scenes of chaos and joy in public places." improv means to do things on the spot. you just go with what pops in your mind and make it work. Improv Everywhere was created in August of 2001 by a man named Charlie Todd. Improv Everywhere carries out "missions" in public places. the groups main goal is to cause a scene of joy. its randomness at its best !
there are hundreds of people that show up to conduct these missions, and this resemebles a flash mob. However in great strength Improv Everywhere wants the public to know that they do not associate themselves as a flash mob at all; since flash mobs were created after their group was.
this group is amazing! i cant believe this many ppl get together to actually do these acts of awesomesness!

Improv everywhere has been seen on many news reports (in a good way) and its popularity continues to grow.