One day, a lazy cat named Tom saw a rail. He thought it was a fun place to play. He jumped on the rail and walked on it. Tom was very happy. A bird named Sally saw Tom on the rail. She flew down and said, "Hi Tom! Do you want to hear a joke?" Tom said, "Yes, I like jokes!" Sally told a funny joke and they both laughed. Later, Tom saw a big dog coming near the rail. He remembered Sally's joke and decided to play a trick on the dog. Tom jumped off the rail and hid. When the dog came closer, Tom jumped out and yelled, "Boo!" The dog was scared and ran away. Tom and Sally laughed and played on the rail for the rest of the day.