How to Unlock Skrillex's "Let Me Try It Out" Zombie Easter Egg in Call of Duty: Black Ops 2

Haven't found all of the hidden Easter eggs in Call of Duty: Blacks Op 2 yet? Then the one you're probably missing is this one in Zombie mode, which is a pretty cool shout to Skrillex, whose music seems to fit in quite well with all of those zombies running around.

This particular Easter egg can be found on the Zombie map Tranzit. You must press X on each of the three fuzzy teddy bears that can be found throughout the map. When you press X, you will hear a "laser zap" sound to confirm that you have activated it. Activate all three and Skrillex's "Let Me Try It Out" will begin to play.

Check out the video below to see where these teddy bears are hidden.

Here is the complete Skrillex song "Let Me Try It Out", featured during actual Zombies gameplay.

Anybody know of anymore songs hidden in Black Ops 2?