Yeah I know about astral travelling, but it is usually warned that during astral travel other beings can come and occupy the body, and not another human. Most humans are already unable to handle their own minds and bodies, so how is it that they can possess another person's body? If it is possible i'd like to try because having 2 bodies would be so much more fun than just having one, and controlling a person is fun too. But I still cannot logically deduce on how does another human being 'possess' another human being in that way...you astral project into another person's body?
Like what you said Ensapa, "most humans" so there are still that small percentage that are able to do that. There are good and bad human beings, hence, those that are being trained and have the ability to possess another fellow human being. But it is just a handful cases.
The ultimate decision to believe or not is still up to individuals because just like spirits, UFOs, gods, demi-gods, and even existence of Buddha, is up to each individual to trust and believe. Even so for the oracles to say something, if we believe and follow instructions is up to us.
Personally I would believe as there are many stories out there that are logical and do not seem fake. Apart from that there are people that has a third eye. There are even some people that have captured these paranormal activities on tape.
But the ultimate decision for one to believe or not is up to us, because there are still no concrete evidences of it.