The clip barringer clinic from The Exorcist (1973)
It looks like a type of disorder that's rarely ever seen anymore except in primitive cultures.
We call it "somnambuliform possession. "
Quite frankly, we really don't know much about it at all, except that it starts with a conflict or a guilt and it leads to the patient's delusions that his body has been invaded by some alien intelligence:
A spirit, if you will.
Look, I'm telling you again, and you'd better believe me l am not going to lock her up in some goddamn asylum!
And I don't care what you call it. I'm not putting her away!
You're sorry? Jesus Christ!
88 doctors and all you can tell me, with all your bullshit is....