This sound comes from Donald's Off Day, a Donald Duck cartoon released in 1944, where the slowing alarm fits Donald's lazy, reluctant morning. The effect was later catalogued as a classic Hollywood sound effect, which helped it circulate far beyond the original short in edits, cartoons and comedy videos. Its appeal has lasted because the winding-down bell needs no explanation: anyone who has struggled to wake up recognises the feeling instantly, and creators reuse it whenever they want a quick, silent-film-style punchline about exhaustion or delay.