This sound is associated with the Mortal Kombat series, where an announcer calls each round before the action begins. Short clips like Round 3, fight became popular far beyond the games because they instantly communicate competition and escalation. Online, creators use it in fighting game edits, sports jokes, debate memes and any video where a third attempt or final face-off needs extra drama. Its staying power comes from how quickly the phrase tells viewers that the real matchup is starting.