Vengeance - It is a primal emotion, one borne from our innately human desires for justice and equality. For some it manifests as simple acts, a refused invitation or an ignored hand shake. Sometimes it gets bigger. Cars get keyed and houses vandalized. But sometimes the human desire for vengeance is so great, so overwhelming, that the only way for them to get satisfaction is through violence. Ever since Homer wrote about the vengeance of the heartbroken Agamemnon, artists and writers have been fascinated with revenge.