I've had several encounters also as far back as 1965, all but one were of the poltergiest spirit. One of my favorite stories, Myself and a roomate were renting a place for a short 3 month period where we were told upfront that it had a ghost inhabitant, we were not too concerned at first but than this ghost or poltergiest was very active. Lights on and off, shades up and down and stereo going on in the middle of the night type stuff and whenever things would happen a musty odor often would be present. Our friends would often be visiting when these things occured.
One night I was home alone and leaving to visit a friend, as I left I turned out the lights on the way out except the light at the bottom of the stairs. I got to my vehicle and realized I forgot my keys on my dresser, so I headed back up stairs and through the livingroom and into the kitchen in the dark, I reached up and grab the string for the light in the center of the kitchen ceiling and at the same time I pulled the string I felt myself bump into a person head-on, but as the light went on, no one was there. That instant turned me into a believer of a paranormal existance.
Good reading on the subject.
http://thelaker.com/haunted-places-in-the-lakes-region