The 3, 2, 1, fight format comes from arcade and console fighting games, where an announcer countdown was the standard way to start a round fairly for both players. Short clips of the cue spread through gaming videos, streams and meme edits because the structure is instantly understood without any context. Editors reuse it as a universal start signal for duels, races, challenges and comedic confrontations, and its nine second build keeps the joke readable even when the actual fight that follows is trivial or deliberately anticlimactic.