The sound is associated with the fast headcrab zombie enemy from Half-Life 2, Valve's 2004 game. Players remember it for its sudden, high-pitched attack cry, which helped make dark corridors and close-range encounters more stressful. Outside the game, the clip spread through gaming edits, mod videos and meme compilations as a quick horror cue. It is still popular because the scream is instantly readable even in very short edits, much like a classic jumpscare scream used to signal immediate danger.