Dead Space 2 protagonist Issac Clarke can do more than shoot aliens and make grunting noises before dying. He also enjoys longs walks and the beach and skating in his free time. If you happen to have your hands on Skate 3, input the code “deadspacetoo” in the cheats section of the game and unlock the alien ghostbuster in free play mode. ( A small warning: Issac’s suit can not be used a flotation device. Stay away from the water.)
source: Joystiq