Well, first let me say I don't believe in "the supernatural"...I think it is possible that there are phenomena that we haven't correctly identified yet, but if these exist I think they are natural, not supernatural. And I don't think there are demons in the JW sense, but that there are some unpleasant things in this world, humand or not.
This happened before I was a JW.
We lived in a house where the previous tennants included a guy that terrorized his wife and kids. (we knew about this but I never gave it much thought till much later) Now, whatever your explanation...bad spirits, 'echoes' of past events, whatever...sometimes I would be alone in the house and would suddenly become terrified. I felt as if someone was in what had been the kids' room, and was coming down the hallway into the living room. I was even scared to look in that direction because of what I might see. Sometimes I would run past that door without looking in. Let me tell you, this makes an adult woman feel really silly.
Now, mind you, I perfectly enjoyed spending time in my house by myself. In general, I like being by myself most of the time, ever since I was a kid. But sometimes, this fear would come over me when I was in the middle of something else. Well, after a couple of years of feeling foolish about it, telling myself it was just my mind playing tricks, whatever, one night I just got mad.
Really, Really P*ssed Off that something (maybe even my subconscious) was making me scared in my own house. Somewhere I had lived for, at that time, a few years. Now, y'all don't know me, but let me tell you when I get a good head of steam up, people who know me tend to stay out of my way. And I was P*ssed. Mad enough not to care how silly this might seem to someone else, or even to myself later. Plus we didn't have any close neighbors, so nobody was going to hear me...So, at the top of my (very loud voice) I yelled:
"MY HOUSE! MINE! This house and everything in it is MINE and I want you OUT! And STAY OUT! Do you hear me? GET OUT OF THIS HOUSE AND DON"T COME BACK!"
Whatever it was never bothered me again. And we lived there for 10 years...
Just another anecdote.