On his first day, a newcomer to prison heard the other inmates roar with laughter each time one of them called out a number. Mystified by this, he asked his cellmate what was happening. "We know all our jokes so well that, to save time retelling them, we've numbered them," he was told. Thinking he would join in, the newcomer shouted "208." To his amazement, the whole prison shook with laughter. The cellmate wiped tears from his eyes and commented, "We hadn't heard that one before."