I have never seen a ghost but had some weird experiences- although I am not sure they were just evil and not harmless "ghosts."
re: "Well then tell us about them"
I had an office upstairs in a building in Tampa that had been a home built in 1890. My space was upstairs, in the rear of the building. I work a lot late at night and frequently had the feeling I was not alone in the building. The most interesting thing was that I would hear sounds quite frequently. Not bumps or anything, but the sounds of a group of people or a party going on. Talking, music and the sound of glasses and silverware. It was one of those things where you heard the sounds while you were doing something else and as soon as they got your attention and you started listening to identify them they were gone. I was up there working one night about 2 AM and suddenly felt here was someone standing right behind me. The instant I felt someone was there I felt someone touch me on my right shoulder, as if to get my attention. I turned, but there was no one there. It STILL gives me goose bumps to think about it or tell someone about it. I put down the papers I had in my hand and left the building without delay. I never went there at night after that. I never sensed the presence or sounds were threatening, just sort of friendly or curious. I go by the building every now and then and wonder if the current occupants have visitors.