Back in the mid-'90s, my best friend and I were volunteer "escorts" at an inner-city women's clinic that provided reproductive health care, including abortion.
Our job was to guide patients into the parking lot, explain the howling mob on the sidewalk, and (with other "escorts") buffer the patients' walk into the clinic.
One of the most rabid protesters was a 30s-something woman who looked to me like the former high-school slut. The first time I ever saw her she jumped out of a car on the busy street fronting the clinic and said to me, "I know who you are--I'm going to have you arrested."
I was a bit surprised. And as it turned out, she never had me arrested (go figure, I never broke any laws), but she was arrested a couple of times for trespassing.
Now we come to the puzzling party of the story. My best friend and I are standing at the clinic fence and the aforementioned protester says to us, "I saw you last night, on this parking lot, taking part in a Satanic ritual murdering a baby. I saw you with the demons! I know what you did!"
My friend and I exchanged glances. Our unspoken questions were, "Does she believe what she is saying?" Damned if I know. Maybe there is a clinical term for this kind of delusion. While she was saying it, she seemed to believe it.
She called the police and when they came, I helpfully suggested, "Tell the officer what you were telling us about the demons."
She looked at me as though she didn't know what I was talking about.