The line comes from The Karate Kid Part III, released in 1989, where Cobra Kai is presented as a ruthless rival dojo built on aggression and refusal to quit. Its slogan, Cobra Kai never dies, captures that philosophy in four words, which is why it survived long after the film itself. The later Cobra Kai series brought the dojo and its motto back into popular culture, and editors now reuse the short clip as shorthand for stubborn rivalry, revenge arcs, and villains who simply will not stay down.