Well I don't know if it was a ghost or a spirit or maybe just an energy, but I had an interesting experience a couple of years ago.  I was living at my parent's house at the time and they were away for the weekend so I was home alone.  I had a friend come over to my house and we were just hanging out, drinking some wine and chatting.  We finished the bottle of wine and I placed the empty bottle on the kitchen table next to a candle I was planning to put in it.  We decided to go out to meet some people and came back about 2 hours later.  When I opened the front door I saw the candle was placed in the neck of the bottle AND IT WAS LIT with only one drip of wax running down the side.  I had an alarm set with motion detectors when I left the house.  These candles burned very quickly, so it must have been lit just moments before I got home.  I'm so glad I had a friend with me to vouch for it because no one believes it when they ehar it.  Funny thing is, it was almost comforting to me because I think it was my grandmother telling me she was there to watch over me.  I felt very peaceful for a while after that happened.  I've been waiting for something like it to happen ever since, I have a fascination with it.