Demonic Possession???

We are bombarded with movies, books, tv shows of demonic possession. We are shown images of projectile vomit and heads spinning 360. I have never witnessed anything like that, there are moments that I seen people dancing, in a trance, and tremors. Have they been possessed by demons of their faith? I don’t know.. I’m sure this is the shortest posting from me, but I’m not going to beat around the bush about this… I have no clue.. I want to believe that it may be possible, but then again I want to believe that the world well explode around December..