This past Saturday, October 30, Tom Cruise spent the day as his super-spy counterpart Ethan Hunt shooting scenes for 'Ghost Protocol,' the next installment in the 'Mission: Impossible' series. Fans gathered not just to get a peek at a real-life movie star, but also grit their teeth in terror, as they watched Cruise perform a mind-blowing stunt on the world's tallest building.

Standing at 2,717 foot, the Burj Khalifa -- located in Dubai -- is the world's tallest man-made structure, ever. Cruise hung from the side of its observation deck, way up on the 124th floor, and thumbed his nose at gravity, successfully pulling off a dangerous chase scene with another actor. A helicopter circled the actors mere feet away, while the crew shot the stunt from the floor above. His spokeswoman told the Daily Mail, "Tom has been preparing for the stunt for some time. He believes if he performs the stunts himself, the audience believes more in his character."

Cruise is no stranger to big stunts on his movie sets. For the opening of 'Mission: Impossible 2,' Cruise performed a dangerous rock climbing stunt on his own -- without the benefit of a safety net and against the urgings of the film's producers. After filming this latest death-defying act, Cruise hurried to a 'MI' press conference, instead of spending hours kissing the sweet, stable ground beneath his feet.

And in case anyone is doubting that Cruise was actually up there, Moviefone received confirmation from Paramount Pictures that it was in fact Mr. Cruise.

The plot of 'Ghost Protocol' is being kept under tight security. All that is known is that series regulars Cruise, Ving Rhames and Simon Pegg will be joined by Jeremy Renner and Josh Holloway. The film, which is co-written by J.J. Abrams and directed by animation visionary Brad Bird, is scheduled to hit theaters on December 16, 2011.

Check out more photos of Cruise scaling the sides of the architectural phenomenon, and feel bad that the 48-year-old thoroughly schooled everyone on what it means to commit to a job.