I've yet to see any phantoms but anecdotal evidence throughout hundreds of years leads me to believe something may be occurring that we do not understand. It's certainly fascinating, regardless. A reputable woman who we worked with has a sister who owns an old Victorian style house and she would tell us tales of goings on over there. She even invited me visit a few hours and see for myself if anything happened but I declined.
She was never dramatic about it. It would come up in conversation as casually as something like cooking, etc.