I went to a talk by Alan Parker (probably more than 20 years ago). In it he talked about watching a screening of his film Midnight Express. There is a scene in the film where Billy, the main character, bites out the tongue of another man at the end of a fight. He intended the scene to be tragic. It was supposed to show how prison had brought Billy to a place where he had completely lost everything he used to be. But, to Parker&#x27;s dismay, some of the audience cheered because all they could see was the vengeance that Billy was taking on the other character.<p>Parker said that he resolved after that not to use violence in a film in that way again.