No single widely documented source is attached to this one-second clip, and it circulates mainly as a short, reusable soundboard item rather than as a scene from a named film, show or song. That anonymity is part of its appeal online, because the phrase this is works as a neutral lead-in that fits almost any topic, joke or reveal. Creators reuse it in memes, reaction edits and short-form videos when they want a clean, instantly recognisable setup, and its very short length makes it easy to drop between other sounds without slowing an edit down.