Since their humble beginnings in New York City in 2001, Improv Everywhere has grown from a small gang of restless jokesters into an internationally recognized prank collective and a viral video-making machine. From the 'No Pants Subway Ride,' to 'Frozen Grand Central,' to the 'MP3 Experiment,' their publicly staged scenes of joyful chaos have delighted the hundreds who witness them, the thousands who participate in them, and the millions who watch and share the videos online. "We Cause Scenes: The Rise of Improv Everywhere" is the inside story of this groundbreaking group and its founder, Charlie Todd, who has turned the world into a stage, inventing an art form for the Internet age.