The theme comes from Halloween, the 1978 horror film directed by John Carpenter, who also composed its famous score. Its simple piano motif became one of the most recognizable pieces of horror music in film history. Over time, the sound spread far beyond the movie through remixes, parody videos, and short-form edits online. It is still widely used because a few notes instantly signal suspense, stalking danger, or a playful slasher reference without needing any extra context.