Ive never actually seen one, but I had an apartment when I was younger that had a poltergeist, doors slamming, knives jumping off trays that I was carrying with both hands etc. So yes, I believe there is something in it. My Scotish grandmother was 'in tune' with it all and my mother told me many ghostly stories about my nan. Incidentally, my nan used to always say, 'don't fear the dead, its the living that can hurt you'
I'm a rational person, I totally haven't got a single oz of religion in me, and yet I cant bring myself to deny the existence of ghosts, which baffles me even more.
Ever noticed how when a group of people together and one starts talking ghosts, pretty much everybody has had some form of 'ghostly experience', or at least a spooky and unexplainable experience.....
I much prefer my spirits in a heavy glass