I once shared a room with a young Australian monk who was very strict about Vinaya. One day I came back to the room and noticed that he was more morose than usual. ‘What’s wrong?’ I asked. ‘I have been impure for a whole year without confessing it’ he said. ‘Which rule have you broken?’ I asked. ‘Nissaggiya Pacittiya 18,’ he replied, the rule against touching gold or silver, i.e. money. His confession surprised me because I knew that he was extremely strict about this particular rule. ‘But I’ve never seen you break that rule.’ I said. He hung his head and said, ‘I’ve been doing it ever since Iv been a monk.’ ‘How? When?’ I asked. He opened his mouth and pointed to a gold filling on one of his back teeth which he had apparently only just remembered.