What jokes did Lu Xun tell Yu Dafu?

One night Yu Dafu was a guest at Lu Xun's house, and Lu Xun told Yu Dafu a joke:

An old monk is dying, but he doesn't want to leave because he has an unfinished wish. After repeated questioning by his disciples, the old monk finally revealed his heart: I have never seen a woman in my life. Birds cry when they die, and people talk well when they die. So the disciple paid the prostitute to undress, and the old monk sighed, alas, it turned out to be just like a nun! He died suddenly in regret.

Yu Dafu laughed until he left Lu Xun's house. When I got home, I immediately rummaged through the books, trying to find the source of the joke, but without success. I admire Lu Xun's extensive knowledge.

Hehe, I didn't expect Lu Xun to tell such an indecent joke.

But this joke contains a profound philosophical truth: we don't cherish what the reality has, but pursue the illusory, because we can't get what we want and suffer all our lives. Don't we know that happiness is around us, right in front of us? We are far away from nearby and pursue the other side of imaginary happiness because we have no consciousness. Consciousness is very important, we should live and understand it.