This sound is associated with Call of Duty Zombies, the long-running zombie survival mode in the Call of Duty game series. Short enemy and ambience clips from Zombies maps became popular beyond gameplay because they instantly suggest pressure, danger, and being surrounded. Online, creators use these sounds in gaming compilations, horror jokes, and reaction edits to give ordinary moments a darker arcade-survival tone. Its staying power comes from how recognizable the Zombies atmosphere is to players, even when the clip is only a few seconds long.