Asked Wednesday about his biggest fear during scenes outside the half-mile (828-meter) high Burj Khalifa, Cruise was quick with an answer: "Falling."
The actor is in Dubai for the world premier of "Mission: Impossible -- Ghost Protocol."
Cruise says filmmakers had to monitor temperatures on the spire's sun-baked facade so he wouldn't get burned. That wasn't the only challenge. The actor says he didn't anticipate the cross winds.