Among Us is the social deduction game by Innersloth, released in 2018 and exploding in popularity during 2020. Only impostors could originally use the ship's vents to move unseen, and the metallic vent sound became the tell-tale sign of a hidden killer, as famous as the game's role reveal sound during the sus meme wave. A 2021 update added the engineer role, giving crewmates limited vent access and making the sound even more iconic. Since then the clip has been ripped to soundboards and dropped into social media and video edits as shorthand for sneaky behavior.