Franz Mair and Peppi Knünz of Montafon, Austria claim to have invented alpine soccer. It's a regular game of soccer, but played on the most extreme slopes available in the Alps. In this case, that looks like almost 40º.
This video, which is a promotion for Mercedes-Benz, shows a demonstration of the sport. It's an orthopedic surgeon's dream come true.
-via The Presurfer