It's an unknown quantity. It's actually almost a cliché to say it, how hard comedy is. What's that famous quote? "Dying is easy, comedy's hard." I think the broader it gets, if you miss by a millimetre, you've missed completely. It's a very hard thing to do.

But this is where you get all the market research and things get in danger of becoming formulaic, and where you depend on brands and getting recognised actors. It's the thing that precludes risk very often, otherwise everyone would be avant-garde all over the place.

There's a paraphrase about Orson Welles saying: "Great films are made by great directors and the rest are made by everyone else." I've been very lucky... before I start insulting the profession of directing, but I think a good director is everything and a bad director really is nothing at all.

I think the dictator director is based upon stories from the past. I don't think anyone would put up with it now. There are a lot of people on a film set with egos. So, to be completely authoritarian, you'd probably have to have a reputation like Kurosowa or somebody to get away with it.

In filming you're waiting. You're waiting for lights. You're waiting for people set things up. And when you're not waiting, you're repeating. And neither is conducive to spontaneity, you know. Comedy makes you very, very neurotic because you think, I - but did I nail it?

Almost every comedy you see is about people making all wrong choices and making all the errors of judgement possible. Good comedy is when it works on this scale. Because it is psychologically very real.

'La Dolce Vita' made we want to go to Rome and, if not jump into the Trevi Fountain, at least watch someone else do it. Maybe that's why I married an Italian...!