Anger

Anger is such a powerful emotion because anger can make people become unaware of what they are actually doing and it impulsively leads to incontrolability and possibly later regrets.  There are quite a lot of cases in which a angry get out of control. Angry itself is often one of the the reason that trigger the story in whether the film or novel. Take an example of the Fire and Ice. The young price was bitten by the wolf of Aya Stark when he was fighting and humiliating a son of a carpenter. After he was bitten, he becomes hatred toward the Stark family. When he becomes the king, he still remembers the past and kills the leader of stark family without accepting others opinion of exiling the leader. His action triggers more anger. The house of Stark rebels and the daughters and sons of the leader try to kill him and subvert his family's ruling position.