There is a story, an old lady and a boss bet that he had a mole on his ass, and bet another person that the boss would take off his pants and let him.

The version I heard was that a monk was sent to the foot of the temple to raise money to repair it. The monk found a famous rich man at the foot of the mountain. The rich man is famous for his meanness, but he is embarrassed to say it directly. He said to the monk in front of everyone, "You can ask Niu Erpi to take off his pants in front of you, and I will give you two hundred and twenty pieces of silver."

Niu Er is a villain and is famous for being difficult to provoke. The monk found Niu Er: "You have a mole on your ass, which is an ominous sign. You and I are predestined friends, and the poor monk uses Buddhism to solve it for you. "

Niu Er doesn't believe it, but he can't see it. The monk said, "Monks don't talk nonsense. You can ask the rich man to testify. If there is no mole, he should give it one hundred and twenty pieces of silver. "

Then, the monk went up the mountain and built a temple with one hundred and twenty pieces of silver.