My girlfriend once saw a figure of my grandad on the staircase of the house the first time she came here, she had no prior knowledge of what he looked like as she hadn't seen any photos of him, yet described him perfectly.
He had died two years before her and me even met.
More worrying is that she seems to feel watched whenever she is in my house to the point I have gone into my bedroom before from having a cigarette outside to find her goosebump covered, crying and shaking saying a black figure was stood in the room with her. It took me ages to calm her down and even longer to get her to turn around and come downstairs. We have heard doors banging, lights coming on and off, footsteps, shrieks, things like car keys will vanish and reappear somewhere else, whispers and crying, temperature drops and even had a hand print appear on a window that had not long been cleaned. She has seen a figure in my bedroom doorway at night which i worrying. There is also an oppresive atmosphere about the place, like a big cloud is having over the house, its most unpleasant.
But it only happens when she is there, when I'm home alone its a quiet and comfy as a mouse. We contacted a medium (rather she did and then told me) who explained some entity in the house (whatever that may be) is clearly extremely unhappy with her presence there and is very very keen to show that. Since then she has come over a few times and it gets progressively worse the longer she is there. It doesn't affect us relationship wise (if that is the intent of it) but freaks her out, and me if I am honest.