This clip comes from a user-generated soundboard where it was simply labelled as entry number ten, 'falling', with no credited source, so its exact origin is unknown. The descending-whistle fall is one of the oldest cartoon gags in sound design, popularised by mid-century animation where a sliding whistle scored every cliff drop and pratfall. The trope survived into internet meme culture, where editors drop it under fail compilations, gaming bloopers and slapstick sketches. Nearly ten seconds long, this version gives creators a full, drawn-out slide to stretch across a slow-motion tumble before the landing.