There was a cat named Maomao who liked to eat bread and fish.
One day, a fish said to him, "Maomao, do you want some bread? I can help you." Maomao was delighted. However, the fish added, "But you must give me something in return."
"What? Oh, that's fine," replied Maomao.
"You'll give me a pen!" demanded the fish. So, Maomao gave the fish a pen.
Then the fish declared, "You are foolish! I don't intend to give you anything!" Maomao became very angry with the fish.
What a clever fish!