Improv Everywhere

ImprovEverywhere: a group of New Yorkers who do group comedy hoaxes throughout NYC. I particularly recommend:

1. Freeze
   Hundreds of participants simultaneously freeze in Grand Central Station.
2. Synchronized swimming
   Synchronized swimming in fountain in Washington Square Park
3. Even better than the real thing
   Fake U2 band plays on rooftop beside Madison Square Garden
   [The show]
   [New York Times story]
4. Suicide jumper
5. The Moebius
   A looping event played in Starbucks with multiple actors