One of the things Ford Prefect had always found hardest to understand about humans was their habit of continually stating and repeating the very very obvious.
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.
Harry, don't go picking a row with Malfoy, don't forget, he's a prefect now, he could make life difficult for you. . . " "Wow, I wonder what it'd be like to have a difficult life?" said Harry sarcastically.
Six pints of bitter, said Ford Prefect. And quickly please, the world's about to end.