“Can't stay long, Mother," he said. "I'm up front, the prefects have got two compartments to themselves-""Oh, are you a prefect, Percy?" said one of the twins, with an air of great surprise. "You should have said something, we had no idea.""Hang on, I think I remember him saying something about it," said the other twin. "Once-""Or twice-""A minute-""All summer-""Oh, shut up," said Percy the Prefect.”