Why do you say "Cao Cao and Zhang Fei play charades-you guess yours, I guess mine"

Legend has it that once, Cao Cao invited Liu Bei to dinner. Liu Bei was afraid of being framed by Cao Cao, so he ordered Zhang Fei to go to dinner instead of him. Zhang Fei came to Cao Ying alone. Cao Cao greeted him at Yuanmen, greeted him and asked, "Why didn't Liu Huangshu come to dinner?" Zhang Fei said, "My eldest brother is not feeling well. Let me go to the dinner instead of him. Let me thank the Prime Minister for his kindness. " After Cao Cao led Zhang Fei to enter the account, he went to dinner. After three rounds of drinking, Cao Cao suggested guessing dumb fans while drinking, and Zhang Fei immediately agreed. Cao Cao first stretched out his hands and drew a circle, meaning that he wanted to monopolize the Central Plains. Zhang Fei thought for a while, thinking that he would be allowed to eat fried dumpling, so he stretched out his arm and made a face-pulling gesture, which meant that eating a face-pulling noodle was good. Cao Cao was taken aback and thought that Zhang Fei said: You want to monopolize the Central Plains, please see if I agree with Zhang Ba spear! Cao Cao also held out his right thumb, indicating that he was the prime minister of the dynasty and could command the princes with the help of the emperor. Zhang Fei thought he was only allowed to eat a bowl of Lamian Noodles, thinking, no, no, how can a bowl be enough? He stretched out his right hand and shook it a few times. Cao Cao was taken aback again and thought that Zhang Fei said, It's nothing, just like you! Cao Cao held out five fingers of his right hand, meaning that he had five generals, namely Chu Xu, Xia Houdun, Zhang Liao, Zhang He and Yu Jin. If not, see you on the battlefield. When Zhang Fei saw it, he thought he would only eat five bowls. He felt that it was not enough, so he shook his hand and held out three fingers of his right hand, meaning that five bowls were not enough for my stomach! At least three pots are needed. Cao Cao thought that Zhang Fei laughed at him and said, "Your five generals are vulnerable. How can they be equal to my three sworn brothers in Taoyuan? " ! Finally, Cao Cao sighed and thought, Oh, my God! I just think that Zhang Fei is a rude person and I intend to laugh at him. Unexpectedly, he can even solve my riddle. Cao Cao had to give up and took the glass and drank three cups. Zhang Fei, satiated with food and drink, said goodbye to Cao Cao and flew back to Han Ying. Later, according to this story, people made up a two-part allegorical saying "Zhang Fei and Cao Cao are drinking and playing charades", which is a metaphor for the difficult-to-guess questions raised by both sides; It's Zhang Fei and Cao Cao who play charades-you guess yours and I guess mine. Personally, I think it's just that they have different perspectives and different understandings.