The alert sound comes from Metal Gear Solid, Konami's stealth game series that made hiding from guards and avoiding detection central to its gameplay. Whenever an enemy spots the player, the game triggers this tense sting and switches to alert mode, a mechanic that became one of the series' most recognisable signatures. Clips of failed stealth runs, speedruns and gameplay edits spread the sound far beyond players, and meme creators later adopted it as shorthand for being caught. Its brevity and instant recognition keep it useful in short-form video.