To be clear, I've never seen a ghost myself, but I've always been wary of them.
As a kid my mom and I watched a lot of those shows where people recount their paranormal experiences and actors play them out. I'd lay awake in bed after, terrified, praying that I'd never ever encounter a spirit or demon or anything supernatural.
And to this day I haven't. Although, there was one time in high school when I felt...something.
My uncle was renovating a shabby two-floor building on Main Street, not far from where we lived. It was a weekend in summer, so my mom and I were free for the day and decided to go over there to give him a hand.
I never learned the full backstory behind the building, but I do know that at one time it used to be a school house and there was a small cemetery surrounding it. A few businesses had rented it out as offices over the years, but they'd only stay for a few months before vacating it.
Once we were there, I went to the lower level to fetch some cleaning supplies. Maybe it was the old wiring or an ancient water boiler humming away somewhere, but I felt something in the air. I grabbed what I needed and got out of there.
My uncle was working there alone a few nights later. He'd been hanging something and had climbed down from the ladder to get some more nails. He was standing at the foot of the ladder when the hammer he'd left at the top came down on his head, bounced up, and then came down again, as if held by an unseen hand. My uncle is an extremely pragmatic man, but even he had trouble explaining what happened.