The Trap: What Happened to Our Dreams of Freedom
"In one famous proof that madness was defined by a patrician establishment, an American follower of Laing, David Rosenhan, arranged for eight healthy researchers, himself included, to check themselves in to mental hospitals. They claimed they could hear a voice in their heads saying "thud". All were diagnosed as ill; it took Rosenhan two months to get himself discharged. One hospital chief, defending the profession, urged Rosenhan to send more impostors and promised to detect them. He agreed, and soon the hospital was boasting the discovery of 41 fake patients. Rosenhan hadn't sent any."
which apparently, according to Curtis, was what led to our current preoccupation with mental disorders from the Diagnostic and Statistical Manual. This wasn't mentioned in the programme, but it occurred to me that Laing and Rosenhan between them would have put a dent in the drug industry's profits which needed to be smoothed out.
I'm definitely looking forward to parts two and three of this series.