Harlem Shake is a 2012 electronic track by producer Baauer that became a huge viral meme in early 2013. Short videos followed a simple format: one person dancing during the intro, then a smash cut to a crowd going crazy at the drop. The trend spread across YouTube, Facebook and news coverage, and it became one of the defining internet crazes of the era. Even now, the song is used as shorthand for sudden chaos, often alongside an air horn in older meme edits.