The Stalker is an enemy from Half-Life 2, and its scream became memorable to players because of the game's bleak industrial atmosphere and body-horror themes. Online, the clip spread through gaming memes, horror edits, and short reaction videos as a fast way to signal dread or suffering. It still gets reused because the sound is instantly disturbing even out of context, especially when combined with abrupt cuts, dark imagery, or a Vine Boom style reveal that turns a normal scene unsettling.