SunTimes: Faithful readers know I'm not fond of heights. That doesn't mean I object to them in movies. I responded strongly to Tom Cruise clinging to the walls of the world's tallest building in "Mission: Impossible — Ghost Protocol." With a movie like "Man on a Ledge," however, I feel toyed with. The movie cuts back and forth between two preposterous plot lines and uses the man on the ledge as a device to pump up the tension.