I was a young kid when I came into contact with my great grandmother. My parents moved into my grandparents home when my grandparents retired to the coast of Texas. Before they moved my grandmother sat my sister and I down and explained how our great grandmother had died in the house and still lived there. We thought she was crazy until one night...
I was throwing a temper tantrum in my bedroom because I hated living in the house. In each of the bedrooms, there was a Tiffany-style lamp that hung above each bed. I was sitting on the edge of the bed, throwing a fit and my father was next to me consoling me. I said, "I hate this house. I hate this house. I hate this house..." As I finished saying it a third time, the lamp above the bed swung backward, then forward and then came out of the ceiling and hit me in the back of the head. My father turned to me and said, "See? You're pissing her off and you shouldn't piss her off..."
We moved shortly after that. I'd like to add that other things occurred in the house besides that experience. We would be watching TV and it would shut off all of a sudden. We would have to get up and actually switch it back on by pulling the knob that was used to turn it on and off.
My sister would take a shower and put her jewelry in the bathroom counter. Nearly every time she did it, she would come out of the shower to find her jewelry in a pile at the bottom of the stairs.
Other people claimed to have seen her standing in our dining room. Other family members claimed to hear breaking dishes upstairs and when they investigated, they found nothing. There was a consistent cold spot at the end of my sister's bed. We had a room in the house that we called, "The East Room..." No one went in there. You could FEEL something or someone... Some sort of presence there.
All in all, I was a skeptic until my experience. Now, I firmly believe in the afterlife, ghosts, etc.