Short counting clips like this circulate on soundboards because they need no context to understand and fit almost any timed gag. The one two three format has long been used in games, sports and classroom activities to sync a start, and online editors borrowed that familiar cue for videos. Shared as a tiny standalone file, it gets dropped into edits where a longer countdown would kill the pace. Its popularity comes from that flexibility, letting creators signal preparation and then deliver the joke immediately after the final number.