I only know it from this video:
[media=https://youtu.be/WzU_LG0jtdc]
I think the majority of poltergeist events are real in the sense people do experience them, but not real in the sense that a poltergeist exists in their own right, at a said location.
Reason why, is
1) We don't see this as a widespread, everywhere phenomena.
We don't as a society see ghosts everywhere. If we did, I would have Aristotle's Dialogues, because I would just go ask him what he said and would write it down. Therefore:
2) It only happens at very specific locations, or with very specific people or family lines.
If it happens only in very specific locations, it most likely indicates some hallucinating phenomena caused by mold, chemicals, etc is present in said location, and if people investigate and instantly encounter a poltergeist, we should take it seriously and shut that location down for public health, tear it dkwn using Hazmat protocols, and segregate the building materials from the water table. Aomething bad exists there not within our science to detect, or we just did our science wrong in investigation.
If it happens only with individuals, then it likely indicates a mental phenomena out of balance to the norm of the species in terms of healthy cognition. This does not rule out crazy people can coexist with unhealthy properties. It can be both. If a family is exposed, it might be a genetic phenomena, and nkt enviromental. If visitors who already have a belief in the paranormal show up to investigate, they may have domapine issues making them more suseptible to fear and might interprete any random phrnomena as a poltergeist phenomena. Or they may be carriers of their own genetic mental disorder and had bad past experiences elsewhere and want to investigate other peoples claims, and you end up with a local mass hysteria of the mentally ill.
3) Why 2) is most likely:
Because we don't encounter ghosts of neolithic cavemen, white people rarely find ghosts of Indians (Indians do though), Turks don't bump into Hittites deapute sharing the same land, or greeks or armenians who only recently lived in their locals. It's almost always culturally specific. The little girl was possessed by a guy named Bill, who lived in the house a mere 12 years prior. How could she possibly know about Bill? She lived in a neighborhood with people who most likely knew Bill. Why was it Bill from 12 years prior and not Jerry from 1931, to Tecumeh the Indian from 1372?
4) And why don't we encounter ghosts of last night's supper? Why don't I see chicken ghosts? Why do cheetahs, who have no body fat and need to conserve energy and only run when they have a high probabilty of catching a meal, not constantly being fooled by the ghosts of dead antelopes? When the cheetah closes in the antelopes vanishes in mid air? Did we go through a period of darwinian evolution to largely ignore ghosts?
It largely doesn't make sense. If a place keeps being reported as ghostly, we should man up, admit we suck at science and quarantine the place. If it is just individuals or a family line, move them and see if it goes away, and if not study their mental states and genetics and hopefully patterns emerge where we can treat it.
5) Also women are really attracted to fear porn. This stuff is largely aimed at them. They haven't been selected like men have been to overcome fearful impulses (men will gp bezerk in battle or line up to be shot in mass musketball volleys- incredibly stupid and a very good thing to fear, but they overcome this fear and have historically done it anyway, socially ostracizing those who ran away with justified fear as cowards. Women haven't been selected for this except for fear of childbirth). Women seem to be the ones who are most into ghost stories and passing them on culturally.