Call of Duty Zombies began as a bonus mode in World at War in 2008 and grew into a long-running co-op survival mode built around waves of undead. Its harsh zombie vocalisations became instantly recognisable to players, and short clips spread through gaming soundboards, YouTube edits and Discord servers. Like the FNAF jumpscare scream, this shriek survived outside its original game because it delivers fear in under five seconds, making it a reusable shorthand for horror, panic and over-the-top surprise in memes.