The buzz comes from the Donald Duck cartoon Old MacDonald Duck, released in 1941, where a fly pesters Donald around his farm. Hollywood Edge later catalogued the recording as a stock fly buzz, which is why the same short clip turns up in cartoons, edits, and sound libraries long after its first use. Its appeal is simple: a single insect instantly signals heat, idleness, and mild annoyance without any dialogue. Editors still reach for it when they need a quick, recognisable cue for a neglected room, a slow afternoon, or an unwanted visitor.