At the Main Menu where you're strapped in an interrogation chair, if you tap both the trigger buttons repeatedly you will actually get up from the chair and be able to walk around the room. You'll even get the Achievement/Trophy "Just ask me Nicely" for doing so. In the room there is also a computer terminal which you can use to read letters, view concept art, listen to the game's soundtrack, unlock "Dead Ops Arcade" and even play the 1980 text-based adventure game ZORK (Which you will also get an Achievement/Trophy for doing).