Interesting question answered at The Straight Dope. Apparently, some people have gotten lucky.
- U.S. Army air force sergeant Alan Magee fell 20,000 feet from an exploding B-17 in 1943 and crashed through the skylight of a French train station. (A lesson emerges: Aim for the skylight.) Though his arm was shattered, he lived too.
- Luckiest of all was RAF flight sergeant Nicholas Alkemade, who leaped from his burning bomber in 1944 without a parachute at 18,000 feet. After a 90-second plunge, he crashed through tree branches in a pine forest and landed in 18 inches of snow. His only injuries: scratches, bruises, burns, and, in some accounts, a twisted knee.
(via Backwards City)