As a teen I was in my room listening to the radio when I felt what I thought was my mother's hand touch my shoulder from behind me. Turning around I was shocked to see there was no one there. I was told later that a relative had passed away that very day.
Another time I was relaxing and reading the newspaper while lying in bed during the afternoon by the open window. When suddenly I noticed some smoke between my face and the newspaper. Thinking there must be a fire I put the paper down to witness a large blue column of smoke rise and move into the ceiling. Then it was gone. Very strange.