I hate to be the person who always asks about such messed up things but my stories are full of them. Anyways, I'm doing some research for my current story and I kinda wonder what can make someone mad to the point they don't know who they are. I'm talking about a sane reasonable person who loses all perception of reality and adopts a whole new personality. I know that it might happen due to some traumatic experiences but I'd like to get more detail on that. Can anyone elaborate or give examples?