" According to Professor Paul Mattiuzzi, most murderers fit into one of eight categories,’ Harry said. ‘One: chronically aggressive individuals. People with poor impulse control who get easily frustrated, who resent authority, who convince themselves that violence is a legitimate response, and who deep down enjoy finding a way to express their anger. This is the type where you can see it coming. "
― Jo Nesbø , Knife (Harry Hole, #12)