The IT clown laugh comes from the wider Pennywise tradition in Stephen King's IT, first published as a novel in 1986 and later adapted for screen in 1990 and 2017. Clips of the clown's laugh have circulated for years on meme pages and soundboards, where short horror stings are remixed with silly endings. This booboo version follows that pattern, turning a familiar scare sound into a joke that horror fans and casual editors can reuse without needing the full scene or any dialogue around it at all.