I am a septic. I have had one all experience but would say I am still a skeptic.
2000/2001 we lived in a shared rented terraced house. House of 'young professionals' - everyone at work except me (I was visiting BF (now DH) for the week - I was still at uni). I know house was empty as had seen everyone leave during the morning and had been home all day.
Lunchtime - I'm standing in the rather long kitchen making sandwiches when I see something out of the corner of my eye. It disappears as I turn my head fully but from what I could make out it was a floor length hooded robe that glided (not walked) across the back room from what would have been the window to somewhere into the wall with the understands cupboard. I was a good 4 metres away - definitely a 'person' in shape and I don't recall any limbs.
Didn't particularly want to walk back through the back room to get to our bedroom, but it didn't feel uncomfortable. I never mentioned anything to bDH.
Fast forward about 6 months - Friday night, me and DH somehow get ontona convoluted supernatural discussion whereupon DH lets slip that be had seen something whilst standing in the kitchen and goes on to describe my hooded figure in detail - same movement, same direction, same lack of limbs, same hooded robe. Hadn't said anything previously as didn't.want to freak me.out.
As a side note I was in my last year of a psychology degree and one of the modules we could take was about parapsychology. Lecturer was keen and had done lots of work - described situation in a factory where workers felt uneasy, items moving etc. They narrowed it down to some sort of low frequency soundwaves from air con unit - they calculated length of wace and every point they calculated a peak/trough would in wave would be where tools/equipment vibrated, staff felt uneasy etc. Got rid of air con unit and got rid of problem.
I think my hooded figure must have been similar - both of us were standing in same place which was about metre away from fridge. Presume it was low frequency soundwaves messing with our heads.
Still skeptical - brains/bodies are mostly water and smallest vibrations are going to alter senses/cause hallucinations etc. Also think that if a 'ghostly entity' why did it look exactly the same/do exactly the same thing each time? Why not be a bit more autonomous.
No idea what it was but pretty much convinced it has an explanation - no matter how strange.