Baauer, a Brooklyn producer, released the trap single 'Harlem Shake' in 2012, built around the shouted 'do the Harlem Shake' vocal and a sample saying 'con los terroristas'. In February 2013 a thirty-second video format exploded on YouTube: one masked dancer grooves alone, then the bass drop unleashes a room of people in costumes flailing wildly. Thousands of versions followed within days, the track hit number one on the Billboard Hot 100, and the drop became permanent shorthand for a scene flipping from calm to chaos.