Who has a joke about Yu Gong?

Gong Yu has a son named fool. His family planted a melon and called it a fool. The eggs laid by hens are called fools. One day, Yugong took a bookworm, a fool and a fool to the market. Encounter a river, can not move forward, passers-by smiled and said: "fool!" " "Yu Gong patted his head:" Yes! " So they crossed the river in a huge fool. After a while, stupid people and idiots are hungry. Passers-by smiled and said, "Two idiots!" Yu Gong patted his head: "Yes! "They cooked the fool and ate it. Three minutes later, we arrived. They bought fools and fools and went home happily.