Some people attending the Governors Ball music festival in New York got a huge surprise when they took a trip to the restroom. The Improv Everywhere crew thought this would be the perfect place to surprise these music fans with a concert of their own so they staged this funny prank. The bands just kept getting bigger and bigger as more people became aware of what was happening. If you enjoyed this video and want to see another one from Improv Everywhere watch Frozen in Grand Central Terminal.