I can't recommend books by Jon Ronson enough. The Psychopath Test is his journey into the origins of the Citizens Commission on Human Rights (CCHR) by Scientology, the psychopath test by Bob Hare, people potentially trapped by the boxes of mental illness checklists, alternative attempts to "cure" psychopathy, and conversations with people like R.D. Laing's son about a problematic room of a schizophrenic. Read it all, and take in the absurdity around the birth of the DSM and children (as young as four years old) being diagnosed with bi-polar disorder.

Funny, worrying, absurd, and a good read.