In the new trailer for 'Mission: Impossible - Ghost Protocol,' Tom Cruise isn't just hanging from the side of the world's tallest building -- he's running down it and swinging from a tether in hopes of getting back inside. If you think that looks vertigo-inducing, wait until you see it in IMAX. Paramount invited Moviefone to see the footage in IMAX last week, and our fingers are still tingling in sympathetic stress.