Unlike a line from a film or a viral voice clip, a horse neigh has no single famous origin, because it is a classic animal sound effect used in cartoons, radio plays and farm footage for decades. On soundboards and in short-form video it survives as a simple, instantly understood joke, a stand-in for a horse, a rural setting or a sarcastic reaction to someone acting stubborn. Its short length makes it easy to drop into edits, and because everyone recognises the sound at once, it still works without any explanation or context.