I’ve only had one experience that I can’t explain, and that took place a couple months after my Dad died.
In the living room of my parent’s house, there was a flourescent light mounted on the ceiling along the south wall. The door leading into that room was on the north side, so usually you flipped a light switch next to the door before entering the room. (The flourescent light on the south side was on a completely different circuit; the only way you could turn that one on was to physically pull a chain down and release it.)
I’d gone to bed one night, and just as I was drifting off, I heard some footsteps come through the hall, across the living room floor (I heard the floor squeak) and I heard the chain pulled down on the light. The light flicked on, and I could see the gleam from my bedroom. I thought it was my Mom, and I called out, but got no answer. I thought it was a little weird, because the light, as I said, was on the south side of the room, and wasn’t used that much…and why would anybody walk into a completely dark room and cross the floor to turn on a light on the opposite side of the room, when they had a light switch just inside the door?
I got up and walked into the living room, and not a soul there. I went to my Mom’s room, and she was sound asleep, with the dog beside the bed, also asleep. I checked every room in the house----nobody there. I wasn’t scared, just bemused. After a while, I realized I wasn’t going to figure it out, so I shut off the light and went to bed. I didn’t have an explanation then, and I still don’t now. Makes no sense. Mom claimed she was always finding doors open, beds mussed up, radios turned on, etc., but I never saw any of this so I can’t corroborate. My sister also claims she heard the TV come on by itself one night, but she’s always been a tad flighty, so I tend to take that with a grain of salt. But that light turning itself on was a new one. And I plainly heard the footsteps. Was it my Dad? You got me. We eventually sold the house to a family friend, and he says he’s never had a bit of odd phenomena since he moved in. I don’t know. That was one for the books.