Mrs. Green lived in a small flat. She was old and did not like any noise at all. If there was a noise, she could not sleep. Above her flat, there lived a young couple. They always quarreled with each other until midnight, so Mrs. Green could not have a sound sleep. So when the couple moved out, Mrs. Green was very happy. As a new young lady moved in, and Mrs. Green thought, "Yes, she looks very quiet." But at four o'clock in the next morning, Mrs. Green was woken up by the barking of a dog. "Nobody here who keeps a pet," thought Mrs. Green, "The dog must belong to the young lady in the flat above." So she telephoned the young lady, and said some unpleasant words to her about the dog.