I was talking to my brother about this thread because a friend of his owns an old farm house. Here are some of his friends occurances.
While playing pool in one of the rooms, a door to the basement opened in front of everybody. A few minutes later, it closed again. It was latched, so a draft couldn't have caused it.
While watching a movie, they heard something in the kitchen and found a frying pan on the floor. It was placed back on the back burner of a stove. As soon as they left the room, it fell on the floor again.
My brother has heard talking coming from the basement. One day while helping his friend wire his home theater system, his friend found bones (what looked to be a femur) in the crawl space under the room.