Zaphod stopped stomping. He had been stomping around the Heart of Gold for days, and so far no door had said "wop" to him. He was fairly certain that no door had said "wop" to him now. It was not the sort of thing doors said. Too concise. Furthermore, there were not enough doors. It sounded as if a hundred thousand people had said "wop", which puzzled him because he was the only person on the ship.