The wakesurfeur Oliver Lawson posted a video where he enjoys wakesurf with nobody to drive of his boat (this is called ghostriding). On a lake in Switzerland, he settled down behind his boat and filmed with his selfie stick. It is necessary to know that to wakesurf, the surfer is not bound to the boat by a rope. He slides on the wave produced by the boat. Thus if he falls, he can say goodbye to his boat. I wonder how many times he trained before doing such a risky thing cause if the boat is going straight without him this could lead to a big crash...