Below are some interesting Easter Eggs for Crysis 2.

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Back to the Future Reference
In the first level you have the ability to flank some CELL soldiers by entering a small sewer after the subway. You should find some electrical wires hanging above your head that say "Caution 1.21 Gigawatts." This is a reference the the movie trilogy Back to the Future where the time machine, made from a DeLorean, needs 1.21 gigawatts of electricity to travel through time. The correct pronunciation is "gigawatts," however, they say "jigawatts" in the movie. Supposedly a scientist the movie team hired said it this way.

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Teddy Bear
In Dead Man Walking, when you jump down the building, the corner of the building is in front of you. Go to the right side all the way in the left corner. On one of the columns of a planter there is a teddy bear.

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CELL Disco Party
In Dead Man Walking you will get an Objective called "Locate the Nanosuit Deep Scan Cradle; Locate Gould." Take the elevator down at the end of the level and go down the hallway. Take a right and look for a security camera and a bank of equipment. Hop the red rope and look for a switch. Hold ACTION to activate the switch and a red light will shine. Head back to the elevator and hop another red rope to reach a second elevator. The switch will be glowing. Hit ACTION again to open it and you will see a strange sight: A CELL disco party in the elevator!

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FUUUUUUUUUU Meme Reference
As you are walking around the city look for the magazine stands, if you look closely one of the magazines that says the words "Simple", on it will have the popular "Raging" meme face on it.