Lao She, what is the original humor?

When talking about humor, Lao She defined humor as "first of all, a state of mind." "He saw the interest in everything and wrote it skillfully." "Everyone is funny, and he is no exception." "It's ridiculous to live to be a hundred years old and try to be infinite." "If you look at things carefully, you can always find funny places; When you get to the nail pit, you will be pessimistic. " In fact, as long as you are a little more careful, it is not difficult to find that Lao She's humorous masterpieces "Lao Zhang's Philosophy" and "Zhao Ziyue" are not all jokes, but also some tears.