Group makes sleeper car on subway NEW YORK, March 21 (UPI) -- New York "prank collective" Improv Everywhere released video to YouTube of members converting a commuter train into a subway sleeping car. The group, which describes itself as a "prank collective" aimed at staging "scenes of chaos and joy in public places," said founder Charlie Todd and accomplices boarded an N train around midnight in February and set up three folding cots with pillows, sheets and comforters in the aisle of the moving train, the New York Daily News reported Wednesday. "We had no idea how people would react," Todd said of the stunt. Many people took us up on the offer of taking a little nap. The stunt was sponsored by the Guggenheim Museum as part of its public events series titled "stillspotting nyc." The pranksters did not encounter any police or Metropolitan Transportation Authority officers, but officials said the group would have been ticked if officials had seen them. "This was a YouTube moment that should have resulted in the receipt of a fine," MTA spokesman Charles Seaton said. Aside from the obvious tripping hazard, placing any large and bulky item in an area of limited space could cause extreme difficulty for customers in the event of an emergency.