The X-Files, Season 2

Scully:
What if there's a connection?

Mulder:
Between the rape case and the Alzheimer's? When they're not drawing childlike pictures they're brutal sex offenders?

Scully:
Dr. Grago's therapy produces acetylcholine. Too much cholinergic activity causes a psychotic state similar to schizophrenia.

Mulder:
You think that Michelle Charters was raped by a 74-year-old schizophrenic?

Scully:
It's possible.

Mulder:
An invisible 74-year-old schizophrenic?

Scully:
Well, maybe it's not in the medication. Maybe it's the place itself.

Mulder:
Are you saying that the building's haunted? If you are, you've been working with me for too long, Scully.

Scully:
I'm talking about an environmental reason behind what's happening there. Even the disinfectant couldn't mask that smell. Who knows what's breeding behind the walls or in the sub-structure. Some fungal contaminants have been known to cause delusions, dementia, violent behavior.