Mother jokes, son doesn't joke.

The child was called a stupid bird by his mother because of his poor grades.

The child said unconvinced: There are three kinds of stupid birds in the world, one is flying first, and the other is too tired to fly. …………

Mom asked: What about the third one?

The child said: this kind of thing is the most annoying. If you can't fly, you will lay eggs in the nest and ask the next generation to fly hard.