This clip is catalogued as Hollywood Edge 320 Metal Hit with whistle, bonk, thump and rattle, a classic studio effects library sound. The published copy notes its use in Sky Trooper, the Donald Duck cartoon released on November 6, 1942, where Donald fumbles through parachute training. Like many golden-age cartoon effects, it was reused for decades because its tiny, bright impact could sell a small prop hit without dialogue. Editors still reach for it today for retro slapstick timing and for layering quick metallic texture into memes and short-form comedy.