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Call of Duty Zombies laugh origin?

Exploring the origins of the zombie laugh sound effect in Call of Duty. Is it inspired by Back to the Future or other games?
GameSpot

WB Games Explains Why Zombies Sound Racist In Back 4 Blood

GameSpot may get a commission from retail offers. There's only one thing worse than a zombie: a racist zombie, and Back 4 Blood, the zombie-slaying shooter, mistakenly has them. After they first ...