Why do pigs joke about sheep?

One day there was a flood in the forest, and animals fled by boat.

But it was helpless and overloaded, so some animals had to be sacrificed.

Everyone decided to tell a joke.

The sheep told a joke at the beginning, for fear of being thrown.

After the story was finished, everyone felt funny, and the sheep was relieved, thinking that they were all right.

But everyone found that the pig didn't laugh and was thrown in a depressed way.

The pig grinned and said, "The sheep joke is really funny! ！”