Being a former soldier, machinist, and mechanic... I can safely say I am one of the most pragmatic, non-spiritual guys around. If it can't be heated, welded, machined, or put into a 3D CAD file, it isn't worth thinking about.
With that in mind, I had just gone through an amicable divorce, and was visiting my nearly 4 year old daughter down the street, at her mother's house. I had played with a small remote control car, chasing myself with it, and getting rolls of laughter from my little girl. After a while, the fun died down, and we both lay down on the small bed facing upwards toward the ceiling.
My daughter was looking up, and I noticed she began to stare at the ceiling. Not just stare, but focus. She smiled and seemed to light up, and did the typical Japanese nod, and sound of understanding. This happened for about 5-6 seconds, and then without missing a beat... She said "Ok...ojiiisan...bye...bye..."."Ojiisan" being the term for grandpa in Japanese. Her grandfather had passed away from cancer about 2 years prior, and he had told us he wished he could see her grow up.
I laid there rather confused, and tried to focus as she was... And on the same spot, but came up with nothing. After this little incident was over, I attempted to get all the details from my daughter, but she was oddly unresponsive about it. She seemed to forget the whole thing just after it happened, and wouldn't talk any further on the subject.
My girl has never done anything like this before or since, and I am still at a loss as to what was going on. I don't believe in ghosts... (At least until I see or become one myself), but this had, and still has me thinking. Her granddad was an old school Japanese man. Mean as a pit bull, but with a heart to match. If anyone could make himself known after death, my Yen would be on him.