John,
My studies did include a brief visit to two separate homes undergoing the research stage for "strange" phenomena, one a family home with a so-called poltergeist and another with a so-called ghost.
I use the expression "so-called" because most people automatically think of spirits of the dead or a belief in the occult or demons, and I am only speaking of witnessing phenomenon under investigation.
I can say from experience that whatever such phenomenon consists of, it is unsettling to say the least. The home of the poltergeist involved having heavy billiard balls from a pool table tossed at us, a collection of records from a hall closet tossed out of a,closed closet and smashed against the wall, hanging light fixtures sent in a swinging frenzy, and window blinds slowly open and shut. The events took place over a period of two hours.
The other home consisted of landline phones being removed from their hook (for those who remember those old phones) and televisions being constantly switched when you left the room to a channel with nothing but static (again before digital TV). That was a four-week visit that also consisted of an apparition sighting that, I swear, looked like a flesh and blood teenage male, around 14, who wore a white button-down shirt, dark slacks, tennis shoes, and walked across a dining room entering from one wall and walking out through another at around 10:15 am one Sunday morning. The sun from the windows even shone on the figure like it did on any other person.
I don't think I was scared as much as amazed and very curious. I remember doing the oddest thing afterwards, touching the wall he walked out of the room through to just make sure it was solid.
I was creeped out at the first house but more disturbed by the home owners of the second home who viewed their "ghost" as nothing but mere fun. An exorcism was suggested by myself and a Catholic priest after the investigation, but the family decided it was unnecessary. I am not sure why they reported it to Catholic channels in the first place as that was their attitude.
But neither experience led to me believing in ghosts or spirits of the dead. So just because you experience "things that go bump in the night" doesn't mean that you have to accept fairy tales. Ghosts have been reported since the dawn of recorded history by all cultures. Just because something startles you or looks amazing doesn't mean that the world will end by being trampled by the Stay-Puft Marshmallow Man.
Some scientists theorize that there are various dimensions to each reality. Maybe they cross. Since we can record audio and video by merely reorganizing iron oxide, perhaps something like this happens in nature that record scenes from the past that just play back as "ghosts."
But if our convictions are such that they could change like the swinging of a door with every unexpected breeze, then maybe our convictions are not as firm or solid as we believe. Seeing an apparition doesn't mean you've seen the ghost of a dead person or that Catholic exorcism is real. It just means you've seen an apparition.