I have no idea what they are in reality, but they are totally different than anyone I have heard describe them. I personally have seen and experienced one what ever it was twice in the same building. Scared the hell out of me. I later told my mother about the experience and she said that everyone she had talked to new the building I was talking about was haunted. It was local knowledge. Now, I am about as Involved with science as anyone without a degree can be. I have no means to express the event, I can describe it. I cannot show anyone the building as since the early sixties when this happened the building has been torn down.
Call me what you want but I have experienced this one twice. My mother has seen them in several places, each as strange as one would think.
I can talk further on this event, but I should state that this event took place on the Zuni Indian Reservation in about 1962-3. The name of the town is Blackrock, and if one looks on Google maps or Earth the town has been totally moved and rebuilt since then.
I will state, probably again, that basically I do not believe what most people experience are ghosts. One does not see a ghost, one experiences it with one's whole body and sensory platform.
I will take all skepticism and non-belief, I am not trying to change anyones opinion, I am just relating what I have experienced.

Although I personally, do not believe, we still can not confirm Dark Matter or Dark Energy. If physics state that energy can not be destroyed, only altered, one day we may find that the energy of consciousness remains in a form we have named "ghosts".

Back in 1970 I was home on leave and my buddy got us tickets to hear "THE WARRENS" speak at a lecture about things that go bump in the night. They were extremely evasive when asked about hard evidence. We met them and spoke with them briefly after the lecture...they were "creepy" to say the least. They were totally debunked years later. Not saying Ghosts don't exist but there is no hard proof.

I believe in the movie Ghostbusters... but I don't believe in ghosts or any such nonsense. That includes poltergeists, banshees, haunts, spooks, spirits (aside from the alcoholic version), specters, wraiths, phantoms, or any such thing.

To me, the whole idea of ghosts is so anthropocentric. It's just another way of trying to make humans seem important. But, there are many things we still cannot explain. Years ago I was at home on vacation. I was sleeping on the sofa in the living room. In the middle of the night I heard some really soothing, beautiful music. I was not dreaming and listened for a while.The next door neighbors often had parties and played loud music but it was mostly rock and this was classical. I did look and the house was dark. Thing is this was an old, fancy Spanish style house in Dallas and the original owner was a pianist who often gave recitals in the living room. I told my mother about this and she said she heard it all the time (she slept in the living room as my dad snored. He had died and now she was back in the bedroom). I have heard that a theory has been given that walls can record the vibrations of sounds and, under certain conditions, play back the vibrations.

Scary movies became much less scary once I started thinking more logically.

I have friends that have participated in exposing ghost fallacies. People get really pissy when you explode their fantasies.

Just another manifestation of woo-wooness.

My feeling is that those who believe in ghosts think that ghosts are spiritual phenomena, so serious, but pixies, well they are fanciful! To them there is a difference, but not to me.

Nah. I haven't got what it takes to believe in ghosts. (And I refuse to apologise to Frank Turek and Norman Geisler)

Some like to watch too many TV shows…….ghosts exist there.