Taken from Pixar's animated film Monsters, Inc., released in 2001, this repeated denial has travelled far beyond its original scene as a reaction sound for short-form video, memes, and gaming clips. Creators use it because the escalating panic needs no explanation: a viewer immediately understands that something has gone wrong and cannot be undone. Its short length makes it easy to drop over a fail, a plot twist, or an ill-judged decision without breaking the pace of an edit. That combination of instant emotion, recognisable source material, and easy timing has kept it in rotation long after the film's release.