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There is an old man in a house. In the house there are many mice. The old man has a cat. Every day the cat catches the mice and eat them.

One day the old mouse says, “All mice must come to my room this evening. We must find a way to deal with the cat.”

All the mice come. Many mice speak, but they don't know what to do. At last, a young mouse stands up and says, “We must put a bell on the cat. When the cat comes near, we can hear the bell and run away. So the cat can't catch us.” “Who can put the bell on the cat?” asks the old mouse. But no one answers.