Radio producer Scott Carrier quit his job at a low moment in his life. His wife left him and took the kids. And he got a job interviewing schizophrenics for some medical researchers. After doing it a while, he began to wonder if he was a schizophrenic himself. And more stories.
http://www.thisamericanlife.org/radio-archives/episode/37/the-job-that-takes-over-your-life