 While there is only speculation about how humor developed in early humans, we know that by the late 6th century BCE the Greeks had institutionalized it in the ritual known as comedy, and that it was performed with a contrasting dramatic form known as tragedy. Both were based on the violation of mental patterns and expectations, and in both the world is a tangle of conflicting systems where humans live in the shadow of failure, folly, and death. Like tragedy, comedy represents life as full of tension, danger, and struggle, with success or failure often depending on chance factors. Where they differ is in the responses of the lead characters to life’s incongruities. Identifying with these characters, audiences at comedies and tragedies have contrasting responses to events in the dramas. And because these responses carry over to similar situations in life, comedy and tragedy embody contrasting responses to the incongruities in life. (Morreall 1999, ch. 1–4). 