I've done a couple of all-nighters at Hermeston Hall which is supposed to be one of the most haunted houses in Britain - it even featured on Most Haunted. We has some majorly creepy experiences in one of the rooms that is s haunted by a de-frocked Bishop - apparently I was jabbering away in a voice that was not my own...and I have no recollection of it at all.
We had a seance and there was very definitely a presence there and I was struggling to breathe and was rocking back and fore - one side of my brain knew what I was doing and was thinking how ridiculous it was bt the other side of my brain was in a place I would really not like to go to again.
We have hundreds of photos with orbs in them.....orbs are supposed to be the first sign of a manifestation but I suspect that the experts here would argue that there is a technical explanation for them!