""You may not instantly see why I bring the subject up, but that is because my mind works so phenomenally fast, and I am at a rough estimate thirty billion times more intelligent than you. Let me give you an example. Think of a number, any number." "Er, five," said the mattress. "Wrong," said Marvin. "You see?" The mattress was much impressed by this and realized that it was in the presence of a not unremarkable mind."