The ringside bell has been part of boxing for generations, rung by an official at ringside to start each round and warn fighters when a round is ending. As boxing footage moved to television and later online, that clang became a universal shorthand for a fight beginning, even for viewers who never watch the sport. Stock versions like this one spread across video edits, games and memes, often paired with a punch sound for comic knockouts, which is why the bell still instantly sets up a showdown today.