The line comes from Who Am I, the 1998 Jackie Chan action film in which Chan plays a man who wakes up with no memory of his identity after a mission goes wrong. The shouted question became the film's defining moment because it captures the whole premise in three words. Online, the clip spread through meme edits, reaction videos and soundboards as a quick shorthand for confusion and mistaken identity. It remains popular because the delivery is short, loud and instantly understood, even by viewers who have never seen the film.