Paul Bettany believes there is no specific formula to making a successful movie.
Paul Bettany believes making a good movie is about guess work.
The British actor - who has starred in films including 'A Beautiful Mind', 'The Secret Lives of Bees' and 'Iron Man' - believes there is no guaranteed way to make a successful film, and he admits many people were surprised at the success of his latest work 'Margin Call'.
He said: "I've never seen more shocked faces. Because nobody could quite believe it had come together so well.
"I thought it was bright and well-written, which is rare, and it was 17 days of filming so I just thought, 'This is a good punt.' It's just proof that you never know.
"People are always trying to work out the formula for making a movie that is well-regarded, but it's like looking at f**king tea leaves."
He said: "This movie changed me in that it reminded me of all the reasons why I first became an actor. I can't make movies that I don't care about any more."