Write the funniest joke in the world.

15. There was an accident on the expressway-the tortoise trampled the cow to death. The police are investigating the cause of the accident and say, snail: How did the tortoise hit you? The lying cow in plaster recalled sadly: I don't remember, he was too fast!

16. A polar bear stayed in a daze on the ice, and when he was really bored, he began to pluck his hair. One … two … three … none left, and suddenly he shouted … how cold!

17. My colleague's daughter is a little beauty embryo. When she comes back from kindergarten, her mother often asks her, "Beauty, did anyone call you that today?" The little girl sighed: "I guess they see me too much, so they think I'm not beautiful."

18. A couple gave birth to a little boy after contraceptive failure. When the baby was born, he clenched his fist and kept laughing. The nurse broke his fist and found birth control pills in it. Then the little boy said, "You two want to kill me, it's not that easy, hahahaha ..."