This clip circulates mainly as a short, user-shared reaction sound rather than as a clearly credited line from a named film or show, which is common for blunt meme audio that spreads through soundboards and short-form edits. Its appeal is the directness of the phrasing: one speaker, no setup, and an instant judgment that fits almost any unbelievable moment. Because it is only about five seconds long and easy to drop over a reaction, a fail, or a surprising reveal, creators keep reusing it whenever they want disbelief to do the comedic work.