Clattering teeth has long been a stock cue in cartoons, haunted house attractions and low budget horror, drawn from the real reaction of a jaw trembling with cold or fright and from wind-up novelty teeth toys. Online it spread as a short, reusable spooky effect for edits, games and Halloween posts, often paired with a bone crack for skeleton jokes. At around three seconds it works as a quick sting rather than a background loop, which is why creators keep returning to it for nervous, shivering and creepy reveals.