It is the purpose of humour to speak out other people's unexpected language and express other people's unexpected meanings, that is, the so-called innovation and winning by surprise, which will often make your language special persuasive and achieve better communication results.

A customer drinks at a hotel. After he drinks second cups, he turns around and asks the owner, "how many barrels of beer can you sell a week?"

"35 barrels."

The boss replied triumphantly.

"Then," the customer said, "I'll think of a way to sell you 70 barrels of beer a week."

The boss was surprised and asked, "what is the way?"

"It's very simple, as long as you fill up the beer in each glass."

The customer's intention was to accuse the boss of selling only half a glass of beer, but he used his boss's "mercenary" mentality to set up a trap so as to let the boss unknowingly drill into it and then unwittingly accuse the boss of his behavior.

In fact, all humor is achieved by "surprise".

Otherwise, it will appear insipid and ineffective.