I recently finished reading the excellent sports book The Underdog, written by the Arm-Wrestling, Backwards Running, Sumo Wrestler Joshua Davis, and I highly recommend it. It's a great read.
You can check out the book (and read a sample chapter at Underdog Nation). The website also has links to loads of other 'Underdog' Sports and Games, where you can find out more before you 'Enter The Fray'!
In amongst all of the wierd and wonderful Underdog Sports, Miniature Golf gets a listing too. Great stuff.
The Underdog Nation