I did have one, small experience. Nothing dramatic, but I saw something.
I was at a small party in college. At a girl's house that I was dating, along with about 6 or 7 of her friends. I was standing in the kitchen drinking a bevo when, to my left, down the hall extending to the den, I saw an old woman in a yellow nightgown float right by the doorway. It was like she was on one of those trams at the airport....I didn't see feet, no bouncing motion of someone walking, she floated on a straight line from left to right. But, she wasn't really "ghostly" other than that. She was crystal clear, wearing that yellow nightgown.
Anyway, I said "Is anyone else here?" And, before waiting for anyone to answer the question, I walked down to the den, and there was no one in the room. I walked back into the kitchen, and the girl I was dating looked at me and said "Oh no....You saw her didn't you?"..........I said "who?"......and she said "My grandmother...this was her house.....she left it to me when she died...."
I was skeptical...I told her I had seen an older woman, and then she asked "was she wearing a yellow nightgown?"....that sealed the deal for me. I knew I'd seen her dead grandmother. She went on to explain that she'd had a number of run-ins with the ghost, all very pleasant, but that they were frequent for her. And, anyone who spent a considerable amount of time in the home would inevitably run into her....
Ended up dating the girl for a couple of years after that. Stayed in that house a lot, but never had another sighting. It was always in the back of my mind when I was there though.