The line comes from Michael Jackson's Smooth Criminal, a track from his 1987 album Bad that was later released as a single. In the song, Jackson repeatedly asks the question over a tense, percussive groove, turning it into one of the track's most memorable hooks. Because the delivery is so distinctive and instantly tied to Jackson, short clips of the phrase circulated widely in memes, reaction videos and edits. It endures as a shorthand for sudden concern, disbelief or checking whether someone is still with you after a shock.