The King of Fighters 2003 is a 2003 arcade fighting game in the long-running King of Fighters series, and its announcer calls out the knockout at the end of a round. The short KO clip circulated through fighting game communities and soundboards as players shared favourite match moments, then found a second life in short-form edits and reaction videos. It remains popular because the call is immediately understood even without gameplay footage, giving creators a compact way to signal that a contest, argument or challenge has decisively ended.