The sound comes from Metal Gear Solid, Konami's stealth game first released for PlayStation in 1998, where it warned players that an enemy had detected Snake and entered alert mode. As gameplay clips, speedruns and reaction videos spread online, the short sting became shorthand for being spotted, and it later moved into TikTok edits, Discord sounds and meme soundboards. It remains popular because even people who never played the game recognise the urgent tone as a signal that secrecy has just failed.