Matt Damon has turned down a string of movie roles because he refuses to act in films with excessive violence.
The Hollywood actor has starred in a number of high action movies including Saving Private Ryan and the Bourne trilogy.
But Damon has rejected a number of scripts which include gratuitous fighting - because he's worried it may affect people's real-life actions.
He says, "I always look at the violence (in a script). I don't want it to be gratuitous because I do believe that has an effect on people's behaviour. I really do believe that and I have turned down movies because of that."