Couplet joke "shit falls in the pond, disturbing the stars all over the sky"

In ancient times, there was a scholar who went to a suspended toilet built by a fish pond at night. It was a clear night sky, and the calm water reflected the stars all over the sky, which was spectacular. The scholar's excrement fell into the pond, and layers of water waves immediately appeared on the water surface, and the blue sky and stars originally reflected in the water immediately became flickering. The scholar was thoughtful and full of poetry. After going to the toilet, he wrote a couplet on the outer wall of the toilet: "shit falls into the pond and stirs the stars all over the sky." However, when he wanted to write a couplet, he couldn't think of a suitable couplet and had to give it up.

After a while, although some literati passed by and saw the couplets on the toilet wall, they felt that the couplets were vulgar, but they were very appropriate and seemingly simple, but it was difficult to find the corresponding bottom couplets. One night, a lout passed by, just in a hurry to pee, and he solved it on the spot outside the wall before he could go to the toilet. It was a moonlit night. When the old man saw the couplets on the wall by moonlight, he immediately smiled and said to himself, "I'm right this time!" " After urinating, I wrote a couplet on the wall: "Pee on the wall and draw mountains and rivers in Wan Li". In this way, there is a complete couplet on the toilet wall: the first couplet: shit falls into the pond, which is full of surprises. The bottom line is: piss on the wall, and Wan Li draws rivers. The next day, passers-by were right. It's really hard to get it right. It's a breeze! It seems that couplets must be practiced!