The Exorcist1973

Dr. Klein:
It's a symptom of a type of disturbance in the chemical-electrical activity of the brain. In the case of your daughter, in the temporal lobe - it's up here - in the lateral part of the brain. It's rare, but it does cause bizarre hallucinations and usually just before a convulsion...the shaking of the bed. It's doubtless due to muscular spasms.

Chris:
Oh no. No, no. That was not a spasm. Look. I got on the bed. The whole bed was thumping and rising off the floor and shaking - the whole thing, with me on it!

Dr. Klein:
Mrs. MacNeil, the problem with your daughter is not her bed, it's her brain.

Chris:
So, uhm, what causes this...?

Dr. Klein:
A lesion. A lesion in the temporal lobe. It's a kind of seizure disorder.

Chris:
Now look Doc, I really don't understand how her whole personality could change.

Dr. Klein:
The temporal lobe is very common...It could last for days or even weeks. It isn't rare to find destructive, even criminal behavior.

Chris:
Hey, do me a favor, will ya? Tell me somethin' good.

Dr. Klein:
Don't be alarmed. If it's a lesion, in a way she's fortunate. All we have to do is remove the scar.