Sybil

But there's also a big problem here, because there are also a number of doctors today who don't believe the dissociative identity disorder is real.

During the 1970s, the book Sybil came out, and it became a popular expose about multiple personality disorders.

Only that book has since been discredited.

The book's subject, whose real name was Shirley Mason, admitted in a letter that she made up her stories about her multiple personalities.

But the book Sybil and the TV movie that was made about it became so popular that the concept of multiple personalities has become widely believed to be a real phenomenon.

Only to this day, there's a debate among psychiatrists whether this disorder is real.

But just to play devil's advocate here, let's say dissociative identity disorder is real.