How many people does it take to change a light bulb? What's the point?

This is an ironic joke. At first, it may come from a writer who described the Vietnam War veterans. When describing how cruel the battlefield in Vietnam is, they always say: Do you know how many people will die to change a light bulb? You don't know, you're not there. . . Next is a joke: How many Vietnam veterans does it take to change a light bulb? Answer: You wouldn't know, you weren't there. . .

Later, people made full use of this format to ask themselves and answer questions to satirize all kinds of people who are not pleasing to the eye. For example, if you see people in the subway playing with their heads down and want to be sarcastic, just tell your friends: How many people does it take to change a light bulb? I think there are at least 100, and 99 of them are busy playing mobile phones. . . For another example, if you want to satirize Trump for always breaking his word, you can say: How many Trump does it take to change a light bulb? Infinitely many, each promised to change, but they didn't come later. . .