What is the first joke in the world?

The world's first joke, the zodiac is a cow.

There is a story: because it was arranged according to the zodiac at that time, it was said that which animal came first, and the mouse was small but cunning, so it was hidden in the cow. Just when the cow thought he was the first, the mouse ran down from him and became the first. In this way, rats come first, cows come second, and cows become jokes.