What weird sentences have you seen on toilet stall doors?

In the second grade of elementary school, there was this poem written on the wall of the public toilet: People are on people, flesh is in flesh, moving up and down, it is endless fun. However, I naively wrote it into my composition and showed it to my mother before I handed it in. After reading it, my mother and my father talked in the room for a long time. The specific content can now be imagined. In the end, I was asked to erase the poem without any explanation, but I was still very naive and confused as to why I was asked to erase it. In the end, there were several empty lines in the middle of the composition paper. Fortunately, I wiped it out at the time, otherwise I would have definitely become famous in school. During the military training in the first year of high school, I lived in the non-commissioned officers’ dormitory. Thirty boys live in one house. The toilet is a connected pit with a slogan: "Brother, you are holding the future of mankind in your hands, take it easy." Since then, the word "future" has had a hidden meaning in our class. Socialism is good.