Classical Chinese shows that some people are shameless.

Nowadays, husband and wife admire each other in Curie Lane, and wine and food games compete with each other. They laughed, shook hands, showed off their lungs and livers, pointed to the tears in the sky, and vowed to live and die. If it is true; Once you have a small interest, it's like hair, if you don't know it. If you fall into the trap, you will be rescued by different hands, pushed back and hit the stone again. This is suitable for animals to do things that Yidi can't bear, while people think they can do it. Smell the thick wind, and you can feel less ashamed. -Han Yu's Epitaph of Liu Zihou

Some people in the neighborhood admire and please each other. Some people often eat, drink, talk big, smile as much as possible, express their willingness to live under each other, shake hands, show each other the shape of their liver and lungs, cry at the sun, and swear that no one will abandon their friends regardless of life or death, which is as credible as truth. Once you encounter a small conflict of interest, as small as a hair, you will turn your face and deny people. When a friend falls into a trap, he won't reach out to save him. Instead, he will take the opportunity to push him and throw stones down. There are such people everywhere! This should be something that even those animals and savages can't bear to do, but those people think they have a way. When they hear Zi Hou's noble morality, they should feel a little ashamed!