EW - You've seen it a hundred times, in any thriller that finds the hero perched on a ledge or on the edge of a building's rooftop. The camera moves up and tilts downward, in a smooth unbroken shot, so that we can all know that the actor is really standing there. By now we're more than ready for that shot (it's become fairly ho-hum). But there's no way that I was ready for the extraordinary, dread-inducing Look Ma, no safety net! sequence in Mission: Impossible — Ghost Protocol where Tom Cruise makes his way across the surface of the Burj Khalifa in Dubai — the world's tallest skyscraper — while clinging to the building's glass panels with a pair of electrified adhesive gloves.