Not the overdone hokey BANG, "did you hear that?" incedent but an actual on camera appearance of a misty, translucent, manefestation, that resembles a human and would make u feel that u very likely just saw a ghost?
To my knowledge 3, of course nothing clear cut. I believe the first one they didn't even dwell on as it was filmed in an early series when they were doing the prep work the night before.
Is that the one where Carl was on his own in the woods/ beach (think it was series 9), and then he heard someone running and you saw the outline of a white figure of a man in a distance. Didn't Carl chase after it for a bit too? I remember that one being quite good and interesting. Trouble is I don't even think Ciaran commented on it in the end. I think this episode might have been in Wales, but I could be wrong.
Ciaran never seems to comment on the good stuff. The episode a little while ago when Karl was on his own and the chair and bed moved, he didn't even say anything about it.