The theme comes from The Great Escape, the 1963 film about Allied prisoners planning a mass breakout from a German camp during World War II. Composer Elmer Bernstein wrote the march, and its simple whistled hook became one of the most recognisable film themes of the era. British football fans later adopted it as a chant, which helped keep it in popular culture for decades. Online, creators reuse the clip whenever a scene involves sneaking away, outsmarting authority, or turning a narrow escape into a joke.