This sound comes from Among Us, the multiplayer social deduction game by Innersloth. The game released in 2018, and its sounds spread widely online during the huge 2020 wave of streams, memes and short-form edits. The start match cue became a handy audio shorthand for a round beginning, hidden roles, or incoming betrayal. Even outside Among Us clips, creators still use it when they want viewers to instantly recognise that a game, test or suspicious scenario is kicking off.