Improv Everywhere is a group in New York that plans huge flash-mob stunts, and their videos have been viewed over 370 million times on YouTube.
Think: “No Pants Subway Rides”…now you know who they are.
For their newest stunt, four Christmas carolers went to a random family’s house in New Jersey. Then once they started singing, an entire CHOIR showed up to join in . . . followed by a 20-person orchestra that set up on the front lawn.
Check it out: