Here's what I didn't know when I was starting out that I now know…I thought when you were starting out it was really hard to write because you hadn't broken in yet, you hadn't really hit your stride yet. What I found out paradoxically is that the next script you write doesn't get easier because you wrote one before…each one gets harder by a factor of 10.

I do think the challenge, in a way for me, is to write a narrative film and when you finish watching it you feel like it's a collage. You tell the narrative, you tell the story, but you feel like you've created this tapestry. But it also has a shape, a story. So I think there's a middle ground that I try to strike... away from where everyone else seems ready to go, which is, setup, payoff. You know, He's afraid of water, oh, and at the end he's swimming in water - oh, my God. I hate that stuff.

The worst of the action films are the ones where everything is one shout from beginning to finish. And there's no differentiation between beats, like small or big, or quiet or expansive. It's all just one loud shout.

I have a shoebox: for ideas, fragments, snatches of conversation I hear. I scrawl it down, throw the scraps in the box. Every time I start a new script I start picking through the pieces. Suddenly you get five pieces together and think: this is almost the first Act of a movie, if I flesh it out a bit.

Here's what I didn't know when I was starting out that I now know…I thought when you were starting out it was really hard to write because you hadn't broken in yet, you hadn't really hit your stride yet. What I found out paradoxically is that the next script you write doesn't get easier because you wrote one before…each one gets harder by a factor of 10.

An action film can have too much action; picture an equaliser on a stereo, with all the knobs pegged at 10. It becomes a cacophony and is, ultimately, quite boring.

For years I was doing the excruciating weightlifting of writing scripts - but then I stayed thin and someone else got all the muscles.