'If you made me angry, to me, for that anger to go away, I have to get hold of you ... I have to do something to you.''I didn't feel myself. I felt numb, like a zombie, like a switch had been flicked and a light had gone off.'These are the words of some of South Africa's most terrifying serial killers, who spoke to psychologist Brin Hodgskiss in the bowels of the country's most secure prisons.Hodgskiss interviewed several of the most notorious seri...