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Why do vulgar jokes have a good sense of laughter?

Uncle has a kind heart.

It is really windy today. I just went out and saw an old man being blown down by the strong wind. I went over and asked, grandpa, my salary is 2500 a month. Can I help you up? Grandpa said: girl, you go, I'll wait a little longer! Hey, that's very kind of you. The world is full of love. ...