The scream comes from Valve's Half-Life 2, the influential first-person shooter first released in 2004, where Stalkers are disturbing, heavily modified humanoid enemies encountered in its dark industrial world. Their warped cries became recognisable to players through gameplay videos and walkthroughs, and the clip later circulated on soundboards as a standalone scare effect. It remains popular because it instantly signals horror, danger and something unnatural, making it a quick shorthand for tension in edits, streams and memes.