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In England, nobody under the age of eighteen can drink in a bar (酒吧). Mr Green often went to a bar near his house, but he never took his son, Tom, because Tom was too young. After Tom had his eighteenth birthday party, Mr Green took Tom to his usual bar for the first time. There was one light at the end of the bar. They drank for an hour, and then Mr Green said to his son, “Now, Tom, I want to give you a lesson. You must be careful not to drink too much. How do you know when you have had enough? Well, let me tell you. Can you see those two lights at the end of the bar? If they seem to become four, you have had enough and should go home.”