Skateboard : I propose you two spectacular and astonishing videos showing young professionals skateboarders tumbling down a mountain road at more than 70mph! The least you can say is that Zak Maytum ( first video) and James Kelly ( the second video) are not afraid of anything and like the taste for danger. The practice is relatively dangerous because they cross vehicles and do not hesitate to drive wrong way of the road. And mess tins in this speed rarely are without consequences (see the second video at 2:20 ‘). Watch it in full screen and in HD of course.