One of the hardest things about doing Shakespeare? Making sure the comedy is actually funny, says the director who transported his early play to the jazz ageYou see some Shakespeares so often that you almost never want to see them again. Macbeth is like that for me. I've watched it so many times that I feel I know every line. I've had to declare a temporary moratorium on watching it. In the UK, we have quite a proble…