Over Easter i went skydiving over in Australia with a few friends.  In the middle of the trip we decided to go wing walking.  There was a guy about 3 hours drive away that let you jump out on to the wing of his Red Bi-Plane and go for a stroll before jumping off and hop and popping.

See the Video:

http://www.winisp.net/chrisjohnson/WingWalk-smallest.wmv