A young man saw an old couple sitting down to have lunch at McDonald’s. He noticed that they had ordered one meal and another empty cup. As he watched, the gentleman carefully divided the hamburger in half, and then counted out the fries, one for him, one for her, until each had half of them. Then he poured （倒）half of the soft drink into the empty cup in front of his wife. The old man then began to eat, and his wife sat watching.