I wanted to add that the human brain can actually play tricks on us. Some individuals can see things that are not really there, but they think they are there. There ARE disorders defined of these individuals, like in the movie/true story of "It's a Beautiful Mind" that was a portrayl of a real life individusl John Forbes Nash Jr. He suffered from paranoid schizophrenia. He saw people that did not exist in reality but they looked real to him.

When I went through life saving surgery and was coming out of the anesthesia, I hallucinated and saw a room full of people, they were all blue and white instead of black and white and in the back was a young man that was the only one that had normal color. I was so frightened because it was like the room I was in had no walls and was instead filled with all these people, none of which were anyone I knew. I was not seeing ghosts when that happened, instead I was in fact only hallucinating due to the anesthesia which some people can experience when coming out of anesthesia. It did not mean I suddenly woke up with special powers, it was only my brain's reaction to what I was given and my surroundings.

My father in law was devastated when my mil passed and it was sudden and he did not expect it. He had been with her for about 70 years. He talks about experiencing times where he is sitting in his parlor and he has the TV on and he can see her sitting in the chair across from him. He gets so upset he has to get up and leave the room. I explained to him that given he had seen her sitting there so many times over so many years, his brain is actually used to seeing her sitting there and that CAN happen. I explained to him that he doesn't have to be afraid of it, it's just something that can happen from how our brain gets used to seeing something over many years. The brain does get used to experiencing a presence be it another person or even our pet that was there with us for many years. I myself have found myself so used to my little Happy that was so much a part of my life for over 17 years, that a part of me expected to see him, to need to feed him and to bring up to bed at night with me. Many will say, "his ghost is with you" and the truth is, my brain still feels and expects him to be there after so many years of him actually being a part of my every day life.

That is how our brains are, our brains record so much more than we realize. So, it's very easy for some to decide there is something paranormal taking place. Our brains take in more than we realize and at times our own minds can catch us by surprise.