Not one Wall Street executive has been charged with crimes since the 2008 financial crash.

We, as film-makers, are privileged. We can make people cry or laugh. We can make them think and feel. It is a great privilege and a great responsibility.

If you're making commercials which sell products which are unhealthy or which are unnecessary, I think that you are part of a system.

My mother let me know that we're all connected. If some of us become more affluent it's not because we're better or even smarter people - we have a responsibility to ourselves to be a good boy.

Well, of course the general idea was dreamed up by the advertising agency and so my job was to realize that. And we down to Lubbock, Texas, usually and onto a ranch and we would pick cowboys who looked the part and photograph them under dramatic situations - rounding up wild horses or running through streams and then reaching in and taking a drag on a cigarette.

I think that the whole voyeuristic attitude of filmmakers or of me personally - of shooting documentaries and so forth - is an important issue.

That force - which the system tried to laugh at - when it finally broke through and the movement was recognized, the media said they were "just a bunch of spoiled kids, dope smokers [who] don't know what the hell they want." To demean it as something laughable - but that didn't work for very long. It's still an ongoing struggle; they're trying to find out how to fight. It's very exciting times.