Improv Everywhere: Frozen New York

What's worse than an improv troupe that tries to be funny?

An improv troupe that doesn't let the audience know that there's a performance going on. In other words, they just like messing with people's heads.

In New York City, they get hundreds of volunteers to enact these scenarios, usually to the consternation, befuddlement, and confusion of retail shmoes and toursits.

Improv Everywhere is dedicated to causing "scenes of chaos and joy in public places."

This Grand Central Station stunt is the first one that didn't bug the crap out of me... probably because they aren't trying to embarass anyone.