Surfing, a sport also known as "the sport of kings", seems like an incredibly cool pastime. It originated from Hawaii and even though called a "regal sport" is still mostly associated with chill young men and "hippies". Surprisingly, however, it has been a hobby of several unlikely individuals such as Agatha Christie (honestly, can you imagine the author of Poirot and Miss Marple riding a wave? We can't either, but it's true!) and Mark Twain. Several others will also leave you surpr...