The line comes from Stanley Kubrick's 1964 satire Dr. Strangelove, spoken by President Merkin Muffley, played by Peter Sellers, as American and Soviet officials begin scuffling in the War Room during a nuclear crisis. The absurd contrast between world-ending stakes and a schoolroom rule made it one of the film's most quoted moments, and it later spread through reaction videos, memes and soundboards as shorthand for pointless arguing. It endures because the joke still fits almost any modern debate that has lost all perspective.