frozen in grand central

This is a performance art by Improv Everywhere.

This kind of crowd happening has been co-opted for advertisements. For example, the anti-smoking Truth campaign and the more venal cel phone commercial where 20-somethings use their cel phones to coordinate invading a supermarket and taking slingshot rides down the aisles... a bastardization that changes the performances from something intended to give the accidental spectators a surreal experience into a destructive, self-centered joy-ride.

[via boingboing]