The QI klaxon comes from the long-running British television panel show QI, where it is played when a guest gives a specially incorrect answer. The sound became memorable because the show used it as a running joke rather than a normal game show buzzer. Online, it spread through YouTube clips, panel show compilations, and meme edits as a shorthand for being confidently wrong. It fills a similar role to a correct ding, but with a much harsher, more comedic sting.