Mr. Smith usually got up late in the morning, so Mrs. Smith always called him up in order to make him not to be late for work. One day, they had a loud and long quarreling, so they were not speaking to each other. In the evening, Mr. Smith handed his wife a piece of paper. He had written “call me at 7 in the morning” on it. Then without a word, he went to sleep. The next morning, when Mr. Smith woke up, it was already 9:30. He got up and put on his clothes quickly. As he went out, he found another piece of paper on the table. “It’s seven o’clock. Get up!” Mr. Smith woke up later than his wife every morning. After the quarreling, Mr. Smith wanted his wife to wake him up. Mr. Smith spoke to his wife the whole evening. Mrs. Smith did not want to speak to him either. Mr. Smith went to work on time that morning.