The whistle comes from African Diary, a Goofy cartoon released in 1945, where the sound was used as part of the short's cartoon sound design. Catalogued later by Hollywood Edge as a boat and train whistle effect, it circulated through sound libraries long before short-form video made such brief clips easy to reuse. Today creators keep returning to it because a quarter-second blast is instantly recognisable as a boat, needs no explanation, and fits neatly into fast edits, reaction videos and cartoon-style gags.