Teeth chattering has long been a staple of classic cartoon sound design, where exaggerated foley made a character's cold or fear instantly readable without words. The rattling effect became shorthand in animation for shivering, anxiety and comic panic, and later clips of it circulated on soundboards and in meme edits. Today creators reuse it for the same reason animators did: it communicates a physical reaction in under a second and adds a light, slapstick tone to cold, scary or awkward moments.