Listed on soundboards as a movie voice clip for Marty, this short line has circulated mainly as a reaction sound rather than as a well-known quote from a single famous scene. Creators found it through meme and soundboard collections, where short, expressive dialogue travels faster than the original context, and it stuck because the question works in almost any argument or reveal. Its fourteen-second length keeps the setup and payoff intact, while the name Marty helps searchers find it among other movie reaction clips. It remains in use because disbelief never goes out of style in short-form edits.