Pupils have one pen in their pockets, middle school students have two pens, and college students have three pens. What about those who have four pens?

This is a joke derived from an old cross talk joke. Similarly, there are poor people who don't have watches, workers who bring one watch, rich people who bring two watches, and watch repairers who bring three watches; When it rains, those who don't take umbrellas are fools, those who take one umbrella are passers-by, those who take two umbrellas are lovers, and those three umbrellas are workers who move umbrella shops.