One of the more fascinating things in comedy over the last several years has definitely been Charlie Todd and his happy cohorts known as Improv Everywhere. They blur the lines between performance art/flash mob/live comedy and have done so very well with things like the No Pants Subway Ride or pranking a TED talk.

Now, there’s a whole documentary about them called We Cause Scenes: The Rise of Improv Everywhere that you’ll probably buy after you watch this trailer.