There's a book called 10 days in a madhouse by Nellie Bly, an investigative reporter in the last 1800s who faked her way into a NYC insane asylum and then acted completely normally until rescued by the newspaper she was working for. It is absolutely fascinating how easy it was for her to be sent there for the rest of her life and what the conditions were like there and how nobody would consider she was sane when she was no longer acting like anything was wrong at all after she was admitted. I have read it a few times and each time been amazed and very thankful to live now.