A rich man in the Qi Kingdom had two foolish sons, whom he loved dearly.
One day, a man named Ai Zi said to him, "Your sons are ignorant of the world. How will they manage your property after you're gone?"
The rich man grew angry. "Everyone praises my sons for their intelligence and virtue. What you say is sheer nonsense!"
"Then let us test them," Ai Zi suggested. The rich man agreed.
The father summoned his sons. Ai Zi asked, "Do you know where rice comes from?"
The elder son smiled. "Anyone with sense knows it comes from the kitchen."
The younger son blinked. "You're wrong! It comes from the bag."
The rich man, red with anger, scolded them. "You are both wrong! Why didn't you ask me? Rice comes from the barn!"
The moral of the story is that pretending to know something you are ignorant of leads to foolish actions.