200 Improv Everywhere Agents pulled off a hilarious prank in Grand Central Station. At an agreed upon time while they are all moving in the main whole they all freeze for five minutes which turns into a hilarious specticale. Some people were trying to see whats going on, some were taking objects from these people, its just fantastic how they pulled it off. The link to the site has a video of the whole event, well worth watching.

Link: ImprovEvereywhere