The Stalker is a mutated, cybernetic enemy from Half-Life 2, Valve's 2004 first-person shooter, and its high-pitched, warbling cry became a recognisable part of the game's atmosphere. Online editors later isolated that cry and sped up its buzzing tail into the brrrrr heard here, turning a tense horror moment into a punchy scream meme for reaction videos and short-form edits. Its short length and instantly frantic tone keep it useful whenever a clip needs a burst of panic without any dialogue.