The second use of peripety occurs near the end. After finding out about the culprit behind the murder, the protagonist Ja'far ibn Yahya is ordered by Harun al-Rashid to find the tricky slave within three days, or else he will have Ja'far executed instead. After the deadline has passed, Ja'far prepares to be executed for his failure and bids his family farewell. As he hugs his youngest daughter, he feels a round object in her pocket, which is revealed to be the same apple that the culprit was holding. In the story's twist ending, the daughter reveals that she obtained it from their slave, Rayhan. Ja'far thus realizes that his own slave was the culprit all along. He then finds Rayhan and solves the case, preventing his own execution. That was a plot twist .  
When we look at a tragedy we find the chorus in Antigone telling us what a strange thing a human being is, that passes beyond all boundaries (lines 332 ff.), or King Lear asking if man is no more than this, a poor, bare, forked animal (III, iv, 97ff.), or Macbeth protesting to his wife "I dare do all that may become a man; who dares do more is none" (I, vii, 47-8), or Oedipus taunting Teiresias with the fact that divine art was of no use against the Sphinx, but only Oedipus' own human ingenuity ( Oed. Tyr . 39098), or Agamemnon, resisting walking home on tapestries, saying to his wife "I tell you to revere me as a man, not a god" (925), or Cadmus in the Bacchae saying "I am a man, nothing more" (199), while Dionysus tells Pentheus "You do not know what you are" (506), or Patroclus telling Achilles "Peleus was not your father nor Thetis your mother, but the gray sea bore you, and the towering rocks, so hard is your heart" ( Iliad XVI, 335 ). I could add more examples of this kind by the dozen, and your memories will supply others. Tragedy seems always to involve testing or finding the limits of what is human. This is no mere orgy of strong feeling, but a highly focussed way of bringing our powers to bear on the image of what is human as such. I suggest that Aristotle is right in saying that the powers which first of all bring this human image to sight for us are pity and fear.
I think that BIlly Pilgrim's journeys through time could instead be a social commentary on Post-Traumatic Stress disorder. Billy isn't skipping through time, instead he's an old man sitting at his home, his daughter is taking care of him, and when he closes his eyes he suffers his wartime flashbacks and delusions about traveling through space in which he lives in a dream with elements from his life, like how Montana Wildhack was the Porn Star from the book store that Billy visited to see the Kilgore Trout novels. It also explains why the boo