What is the most classic joke in the world?

An American is eating in a restaurant in China. When the waiter brought a panlong shrimp, the American asked, "What should I do with the remaining shrimp shells?"

"Of course," said the waiter.

"no! Don't! No! " The American shook his head and said, "In our United States, we send the leftover shrimp shells to the factory, make them into shrimp cakes, and then sell them to you in China."

After a while, the waiter brought another plate of fruit. The American pointed to one of the lemons and asked, "What do you do with the remaining lemon peel?" "Of course," said the waiter.

"no! Don't! No! "

The American shook his head and said, "In our United States, we send the leftover lemon peel to the factory to make fruit treasures, and then sell it to you in China."

When checking out, while chewing gum, Americans smiled and asked the waiter, "What do you do with the leftover gum?" "Of course, spit it out," said the waiter.

"no! Don't! No! "

The American shook his head and said proudly, "In our United States, chewed gum is sent to factories, made into condoms, and then sold to you in China."

The waiter asked impatiently, "Do you know what to do with used condoms in China?"

"Of course, throw it away," said the American humanist.

The waiter shook his head and said, "No, we sell you used condoms as chewing gum in America."