What the hell is a comedy? The Greeks and the Romans said all you needed was a happy ending. Well, that rules out Woody Allen films such as Purple Rose of Cairo and (probably) Annie Hall. It rules in laugh-riots such as The Searchers and The Shawshank Redemption. It should have jokes all the way through? Well, a significant portion of Billy Wilder’s The Apartment, possibly one of the best comedies ever made, concerns a woman attempting suicide at Christmas. So, no. But we can say we know a comedy when we see one. Right? If the Golden Globe awards...