A Medieval Horror, Reference Edition

The young man asked if we had a Medieval Horror. I asked if it was a book or a movie, doing my usual thing, trying to narrow it down since I had no idea what he was talking about. It's a movie evidently, and I went to work on the catalog, but nothing came up. I asked if he knew anybody who was in it. He didn't. I asked him if he knew anything about the plot. He didn't; somebody recommended it.

I asked him if he was sure of the title. He was. I fed him back the stuff he had told me to make sure I had it right. Among the things I said in my summary was, "So it's a horror movie that takes place in Medieval times." He stopped me. It was modern times, from about 20 years ago. He spelled the name of the movie: Amityville Horror. I felt like a jerk.

For the record: We own 2 copies of the movie and 2 of the book, but both of the movies were checked out.