The scream comes from the male citizens of City 17 in Valve's Half-Life 2, released in 2004, where non-player characters would yell and run during attacks by the Combine. As the Source engine became popular for mods and Garry's Mod videos, players extracted and reused these short voice reactions outside the game. The clip survived because it is instantly recognisable to shooter fans, very short, and easy to place over any frightened character, turning a familiar game moment into a quick comic reaction online.