Mark Twain, the famous American writer, liked to play jokes on others. But once someone played a joke on him. One day he gave a talk in a small town. At lunch he met a young man, one of his friends. The young man said that nobody and nothing was able to make his uncle smile or laugh. “You bring your uncle to my talk tonight.” said Mark Twain. “I’m sure I can make him laugh.” That evening the young man and his uncle sat in the front. Mark Twain began to speak. He told several interesting stories. This made everyone in the room laugh. But the old man never even smiled. Mark Twain told more interesting stories, but the man still kept quiet. Mark Twain went on telling his interesting stories. At last, he stopped. He was tired and quite disappointed. (失望) Some days later, Mark Twain told another friend of his about what had happened. “ Oh, ” said this friend, “ I know that old man. He’s been deaf for years.”