
Once upon a time, there was a little boy. He was playing with his orange toy car, when suddenly his sister came over. She was carrying a bag, and it looked exciting.
The little boy asked his sister, "What is in your bag?"
The sister said, "It's a surprise!"
The little boy was so excited that he quickly opened the bag. Inside was a big orange ball. He couldn't stop staring at it.
Then his sister said, "This is a special ball. If you bite it, it will make your knee feel better!" 
The little boy didn't know what to do. He had hurt his knee and he wanted it to feel better. So, he decided to take a bite. 
After the first bite, he felt an amazing sensation. Suddenly, his knee stopped hurting and the orange ball tasted sweet! From that moment on, the little boy and his sister shared the special orange ball every time his knee hurt.
