Sometimes labeling is only useful, like with OCD. Once you're labeled you can be treated. On other occasions labeling leads to tyranny, like with childhood bipolar disorder in the U.S.

Sometimes the personalities at the helm of the madness industry are, with their drives and obsessions, as mad in their own way as those they study. And that relatively ordinary people are, more and more, defined by their maddest edges.

Guy Savelli's role in the War on Terror began when half-a-dozen strangers, within days of one another, contacted him via e-mail and telephone in the winter of 2003. They asked him if he had the power to psychically kill goats. Guy was bewildered. He did not go around publicizing this. Who were these men? How did they know about the goats? He feigned a casual tone of voice and said, 'Sure I can.'Then he phoned Special Forces.

My worryingly paradoxical thought process could be summarized thus: Thank God I don't believe in the secret rulers of the world. Imagine what the secret rulers of the world might do to me if I did!

There is no evidence that we've been placed on this planet to be especially happy or especially normal. And in fact our unhappiness and our strangeness, our anxieties and compulsions, those least fashionable aspects of our personalities, are quite often what lead us to do rather interesting things.

I have thought sometimes that the sanest people, the people who are just very balanced, very happy, are probably lower achieving than other people. My kind of irrationality happens to be fear or anxiety.

As I glanced at the phraseology of the research report, dull and unfathomable to outsiders like me, I thought that if you have the ambition to become a villain, the first thing you should do is learn to be impenetrable. Don’t act like Blofeld—monocled and ostentatious. We journalists love writing about eccentrics. We hate writing about impenetrable, boring people. It makes us look bad: the duller the interviewee, the duller the prose. If you want to get away with wielding true, malevolent power, be boring.