This sound is best known from the Metal Gear Solid series, where an alert cue and combat-state music mark the moment enemies detect the player. The effect became a long-running gaming reference because it communicates discovery and escalation in seconds. Online, people reuse it far beyond stealth games, dropping it into reaction clips, school skits, and caught-in-the-act memes. It stays popular because the meaning is immediate: the secret is out, the mission is compromised, and everyone understands the joke.