U-2

This guy goes to the extremes. You may know him from this video where he drove a Bugatti Veyron with 407 km/h in Ehra-Lessien. Now he got the opportunity to fly with the Lockheed U-2 capable of operating at 25,900 meters and possibly a little bit more. It must be an awesome experience:

Just look at the airliner at 3:00 in the video just to get an impression how high they are flying.
(Thanks to Egghat for the link)