How to explain the word "foreign" in "making a fool of yourself"?

To make a fool of oneself and make a joke, it refers to a person's words and deeds that are inconsistent with common sense and make people feel funny and unbearable. "Yishan Miscellaneous Collection" calls "calling his brother a family brother, calling his brother a writer" "My brother-in-law." In "The Scholars", Kuang Chaoren said that a scholar in a certain place built a shrine for him and wrote the memorial tablet "Xian Confucianism", and he was laughed at on the spot. The earliest ones who made a fool of themselves were the two emperors Su and Hu in "Zhuangzi Yingdiwang". They pitied the central emperor Hun Chao for having no seven orifices, so he dug an orifice for him every day, and Hun Chao died in seven days, giving up his friend's life as well. Take it off. There are also those who risk their own lives by making fools of themselves. Cao Cao made a fool of himself by treating Ni Heng as a drummer. Ni Heng played the drums naked to humiliate Cao Cao. His method of revenge was very strange. He made a fool of himself by making a fool of himself. It's the fool of the person who made him make a fool of himself, but since he has the ability to make you a drummer, you will only suffer the loss in such revenge. It's a pity that although people like Ni Heng understand this truth, they still can't help but do it. The ancients paid attention to self-cultivation, and their appearance remained unchanged despite the collapse of Mount Tai. However, it is understandable that sometimes when in danger, one becomes panicked and has no choice but to make a fool of himself. For example, in the case of the Wutai poem, Su Dongpo thought that "if he returns, he will lose his old scalp". He was so frightened that he almost drowned himself. He made a big fool of himself and was very different from his article, but this did not damage his glorious image in the slightest. , which makes people think that he has a straightforward temperament. Han Yu went up Mount Huashan and reached a dangerous cliff at dusk. He could not go up or down. He was so frightened that he cried loudly and left a suicide note to say goodbye to his relatives and friends. Although he was a Wenzong whose writings rose from eight generations to decline, I have never liked Han Wengong in Changli who was in the temple, but I like Han Tuizhi who wrote in Huashan. People in the Wei and Jin Dynasties used the performance of characters in such emergencies to judge the merits and demerits of Shenyu, which was unavoidably harsh. You can't be fearless in the face of danger just because Kong Rong's two sons said, "There are still eggs under the nest." famous saying, let’s just say that they surpassed Han Yu and Su Shi.