 I used to be very good at this kind of thing when I was a kid, when I would pretend that I was sick so I didn't have to go to school. And then by late morning, I'd actually start feeling sick because I was so good at acting the part. And I think something like that happens sometimes with these mental illnesses. Now, the more interesting and important question is why exactly so many people would want to convince the world and themselves that they suffer from what would be a debilitating mental illness.