'A screenwriting friend who has recently seen the release of his latest film was chatting with me about the experience of being on set - as co-producer he was present for his film's whole shoot. When I asked him about a particular actor, the star of his film, he said - well, he's an actor. You know what they're like. They're anxious. They always want to know what you think. They need you to tell them how good they are, all the time.' (Introduction)