User blog comment:Callofduty4/Modern Warfare 3 Spec Ops shown at Late Night with Jimmy Fallon/@comment-3195325-20110616155542

@Moto1195 It's the whole idea of fighting against waves of enemies as they get progressively harder and tougher to beat and starting out with a pistol, which is pretty much the concept of zombies just without the zombies.

Slanted Mouth Face.