There are jokes about cups.

American: Have you ever seen a cup made of wood?

China: No!

American: Then why is the Chinese character "cup" beside the wooden character?

China people: Isn't there a word "no" next to the word "cup"? In other words, it is not made of wood.

All right, I'll give you another one.

One day, MM from a sports school visited a boys' dormitory and found a cup on the balcony. Then she picked it up and asked, "Why does this cup have a lid?" The boy hasn't had time to answer. The girl gave it a hard twist, and the lid fell off with a click. Then she asked the boy inexplicably, "Why does this cup have no bottom?"

You got it?