Watching young Afghan skaters in the film 'Skateistan' made me realize why I've spent my entire life as a skateboarder.

I've been a professional athlete, I've directed films, I've run a company with 150 employees, and nothing compares to writing a screenplay. Just the second I think I know what I'm doing, the rug gets pulled out and I have no idea what I'm doing. Because there are so many problems to solve.