This sounds absurd and hilarious, but I'm going to try to explain it as best I can. It's a kind of identity disturbance I've had since I was a kid. If I watch too much TV and then walk away from the screen, I kind of "see" myself from a distance and "I" look like one of the characters from the show. I change my speech patterns and even the way I move. I hear character's voices in my mind. It happened to me this week after I watched a bunch of movie reviews on Youtube, suddenly my brain had an English accent and I was adopting the reviewer's speech patterns and mannerisms, EVEN IN TEXT. The same thing happened when I binge watched Hell's Kitchen. My brain turned into Gordon Ramsay. It's really funny, but also upsetting. I totally know I'm doing it, but it's like I temporarily kind of forget who I actually am. 

It's only temporary, usually just going to sleep or doing something else "resets" my brain to my regular self. And then the next day when I wake up, I'm like, shit. Better not do that again. 

It's been an issue for as long as I can remember. It was fine when I was young, I'd watch a show and then go play with toys or write stories or whatever, continue the story and it was an advantage to be able to get inside character's heads. It was also handy back when I used to write fanfic. But I don't write fic anymore and I don't play with toys because I'm almost 34. So as an adult, it's really unsettling and it's a huge part of why I can't binge watch shows or movies. I avoid most shows that I think might mess with my head. I honest to god lose my true self, it's overwritten with whatever random traits people from TV have. 

This also happens when I'm around other people for more than about an hour. That's a more common thing to happen when you have BPD.