 Well, there are a lot of problems. One of them is that this is how split personalities work in movies and TV shows, not in real life. There was a bestselling book called Sybil back in the 70s. I think they made a movie about the book as well. And that's the one that first popularized this concept of multiple personality disorder. Before that, it existed as a clinical concept, but it wasn't in the mainstream the way that it is now.