The phrase comes from Highlander, the 1986 fantasy film about immortal warriors who must fight until only one remains, and it became the series' defining tagline. Fans quoted it long after the film, and later generations picked it up through memes, gaming clips and reaction videos that use it to crown a single winner. Its staying power comes from its simplicity: in a few words it turns any contest into a high-stakes duel, which makes it instantly recognisable even to viewers who have never seen the original film.