The sound comes from Pantry Pirate, a Pluto cartoon released on 27 December 1940, where such musical stings were used to punctuate slapstick action. It was later catalogued by Hollywood Edge as Vibra Harp and Slide Whistle, which helped it circulate far beyond its original cartoon as a stock effect for editors. Because the descending whistle is instantly readable as a comic drop, animators, video editors and meme makers still reach for it for falls, failures and deflated expectations, keeping a piece of early Disney-style cartoon scoring alive in modern short-form video.