There was once a farmer. He lived near a road. It was not a busy road, but from time to time cars passed the farm. Near the farm gate, there was a large hole in the road. The hole was always full of water, and the drivers of the cars could not see how deep the hole was. They thought that it was not deep. Then when they drove their cars into the hole, they could not drive out of it because it was so deep. The farmer didn't spend much time working on his farm. He spent most of it watching the hole. When a car drove into it, he pulled the car out with his tractor and asked the driver a lot of money for doing this.

    One day, the driver of a car said to him, "You must make a lot of money by pulling cars out of this hole day and night." "Oh, no," said the farmer, "I don't pull the cars out of the hole at night. At night, I fill the hole with water."