Improv Everywhere are a long form improvisation troup which executes pre-planned "missions" which involve socially awkward or unusual situations.
In one of their most recent missions, Rob Lathan gave out 2,000 high fives by standing next to a subway escalator during the morning rush hour. Five additional agents spread out along the adjacent stairs, holding signs that prepared commuters for the upcoming high five fun.
Enjoy the video here.
