“A human being who falls down reminds us of an animal we might have hunted and brought down ourselves. Every sudden fall which arouses laughter does so because it suggests helplessness and reminds us that the fallen can, if we want, be treated as prey. If we went further and actually ate it, we would not laugh. We laugh instead of eating it. Laughter is our physical reaction to the escape of potential food.”
Book:Crowds and Power