The line comes from The Simpsons, the long running animated sitcom created by Matt Groening that first aired in 1989 and built its humour on short, quotable outbursts. Fans clipped exchanges like this one for soundboards and reaction folders because a single phrase can carry the whole attitude of a scene. Shared as a small audio file online, the clip survived outside its episode as a meme reply, used whenever a statement feels so unlikely that a polite response would not really fit the moment anymore.