Some brief catching up for those born with cell phones already in hard: Tony Hawk is a professional skateboarder, and is likely still the most famous skater of all time. He helped reach that peak in 1999 by completing a 900-degree spin on a half pipe. Now, 16 years later, Hawk has successfully completed yet another daring, previously unheard of feat: a horizontal loop in a pipe running perpendicular to the ground.