The line comes from Hokuto no Ken, known in English as Fist of the North Star, the manga created by Buronson and Tetsuo Hara that began in 1983 and became a hugely popular anime series from 1984. Kenshiro, the series hero and master of the Hokuto Shinken martial art, says it to enemies who do not yet know they have been fatally struck. Clips of the moment spread through anime compilations, reaction videos and meme edits, and the phrase survived translation because its calm finality works in almost any language, keeping it a staple of dramatic and comedic edits today.