Why bother?

So I caught the full trailer for Lords of Dogtown. It looks cool enough, a movie about how skateboarding as we know it started when a bunch of Santa Monica surfers took their skateboards to empty swimming pools.

The trouble is, Dogtown and Z-Boys has already told the story and pretty damn well too. I can't see how Hollywood could top the authenticity and storytelling of the documentary. Color me skeptical on this one.