Once upon a time, there was a thin cat named Tom. Tom liked to follow a pen. His friend, a dog named Max, liked to watch Tom play.
One day, Max asked Tom, "Why do you follow the pen?" Tom said, "I like how it moves. It is fun to chase it."
Max wanted to try too. So, Tom let Max follow the pen. They both had fun and played all day. From that day on, Tom and Max played with the pen together. And they were very happy.
