One of the things that is assumed about actors is that they are extrovert, which is almost never the case, in my experience.
Bill NighyI quoted David Hare one of his lines the other day to illuminate whatever point we were trying to make in the conversation, and I said 'What play was that?' and he said 'It was your line, you said it about a hundred and fifty times in The Vertical Hour.'
Bill Nighy