The jingle comes from Super Mario Bros, the 1985 Nintendo platform game whose music was composed by Koji Kondo. In the game it plays when Mario loses a life, marking a failed attempt before the level restarts. As gameplay clips, fail compilations and reaction videos spread online, the short melody became a shorthand for losing in any context, not just gaming. Its simple descending shape makes it easy to recognise in a second, which is why editors still reach for it decades later to signal a mistake without explanation.