Can't stay long, Mother," he said. "I'm up front, the prefects have got two compartments to themselv

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.
----J.K. Rowling, Harry Potter and the Sorcerer's Stone