One day, a boy named Tim wanted to ride on his dad's knee. Tim was very excited and ready to have fun. He ran to his dad and said, "Dad, can I ride on your knee, please?"
Dad smiled and said, "Yes, Tim. Hop on!" Tim jumped on his dad's knee and they started to bounce up and down. Tim laughed and clapped his hands.
But then, Tim's dad's knee started to hurt. He said, "Ouch, Tim, my knee hurts now. We need to stop." Tim was sad because he wanted to keep playing. But he knew that his dad's knee was not okay. So, they stopped and Tim did not get to ride on his dad's knee anymore.
