Can multiple people hallucinate the same thing at the same time ?

[Angrboda]

No, you are not boring anyone. I would only advice you not to believe everything people claim even in groups. Most of the world's population believed the earth was flat, and unfortunately there are still idiots today that still do. 

I understand , it just bothers me that we don't have a satisfactory explanation for those things ( other than the people are lying or hallucinating the same thing) , i found another one that scares the shit out of me
" When my grandmother died one of her sons, his wife and two children, a boy and a girl, moved into the house. My grandparents had lived in that house for over 40 years. To condense it down to the short of it, one day the daughter, who was 20 at the time, heard her name called, turned around in the kitchen to see her dead grandmother standing behind her. She obviously wigged out, dropped the glass she was holding which broke on the floor and ran outside and locked herself in her car. Nobody was home at the time. When my aunt and uncle arrived they couldn't coax her out of the car for a while. She explained what happened and my uncle said yea, I saw her too recently walking down the hallway.  As it turns out, they had all seen glimpses of her in the house but hadn't said anything to each other because it was "crazy." The thing that bothers me most about this is my uncle is a high school history teacher and football coach, my aunt works at the county clerks office, and the two children were more like young adults ages 18 and 20 at the time. None of the four of them are prone to flights or fancy, do drugs, or are known for lying. I have no way of understanding the stories they tell about that house. I simply can't explain it. The son, who was staying in what used to be my grandparents bedroom started sleeping on the couch because he would wake up and my grandmother would be in that room with him looking out the window.

Generally speaking, explanations, particularly scientific ones, are meant to explain classes of events, to find regularities over a broad range of instances. It sounds like you're looking for explanations of specific events or instances. Given that the explanations are generalizations, they are not necessarily going to explain any specific instance. There's a mismatch in trying to find explanations for specific events using generalizations which will always be unsatisfying. This is one of the appeals of anecdotes, which, by their particularity, will always escape definitive explanation using general laws and regularities. Take the miracle of the sun at Fatima. We can postulate that any number of general mechanisms might have been at work at Fatima and might explain the appearance of a miracle, but we do not have enough data about what exactly happened at Fatima to say that this or that explanation was definitely at work, and as such we can never fully rule out the possibility that an actual miracle occurred. This can be a form of defense used to protect the miracle. By examining each general phenomenon that might explain Fatima, because they don't necessarily apply to this or that piece of evidence, each general law can be discarded one-by-one until the only known explanation still standing is that of a miracle. Unfortunately for such a defense or apologia, that argument is an appeal to ignorance and therefore is invalid, but it can be convincing to any who do not recognize that flaw, or who are persuaded in spite of it.