The flutter comes from The Clock Watcher, a Donald Duck cartoon released in 1945, where the concertina tremolo was used as a piece of classic cartoon sound design. The effect later entered stock sound libraries, including the Hollywood Edge collection, which helped it circulate far beyond its original scene. Editors now recognise it as a shorthand for old-school slapstick, so it still appears in memes, reaction edits and short comedy videos whenever a moment needs instant, exaggerated hurry.