The theme comes from Terminator 2: Judgment Day, the 1991 science-fiction film in which Arnold Schwarzenegger returns as the Terminator. Its driving, metallic rhythm became inseparable from the character and from big-screen action, and it has since been reused in trailers, parodies and online edits far beyond the film itself. Because the opening beats are instantly recognisable, creators still use it to signal an unstoppable arrival or a moment played for dramatic effect.