Humor
There is no need to be so serious. Man is the only animal who has the sense of humor. You have never seen buffaloes laughing, or the donkeys. Only the man can have the feel of the ridiculous, of the absurd. It needs great intelligence to have sense of humor; on the lower planes it does not exist. and even all human beings don‘t have it; those who exist on lower planes of intelligence are bound to be serious—serious like the donkeys. Donkeys are very serious people, always thinking about serious things, it seems, much disturbed with all the problems of the world.
I have watched donkeys very closely; from my very childhood I have been very much interested in donkeys. If Pavlov could find many things about man by studying dogs, if Skinner can find many things about man by studying white rats, if Delgado can find many things about man by studying monkeys, I feel why these people have missed the donkey? He comes closest to human beings— a serious philosopher, a pundit, a scholar, a theologian! Who has ever heard a donkey laughing?
-Osho, "I Am That, #12“