finnrot - I know exactly what you are talking about. My Mother instilled such a fear of demons in me that I was terrified to even think about the possibility that the might exist. I also remember hearing the story about the young brother going to see a 'demonized' movie, but in the version I heard it was "The Exorcist." To this day, I am drawn to that movie like a moth to a flame. I've never actually even worked up the courage to see it and I'm 30 now! I've rented it a few times, watched about 45 minutes of it and then just have to turn it off.
I don't know if it's possible to be a fundamentalist JW, but my Mom was definitely one. She wouldn't allow Bewitched on the television...period! It's so funny because Bewitched was forbidden, but I Dream of Jeannie was alright. I guess genies are ok, but witches are out! LOL!