OMG! Alert! Alert! The City of Redfield has been hit by an outbreak of exploding zombies! For cool and unimportant reasons these suckers literally explode when shot, showering their zombie brethren ...

Call of Duty: Modern Warfare 3 Zombies has many Easter eggs, one of which allows you to pet a hellhound. You can also use its abilities to advance in the game, including using it to revive yourself.