Never seen anything like that personally, my parents have told me some things that happened when I was a baby in our first house, and some of the things they told me just cannot be explained. I wont write them out though because there's too many stories and I'm tired... I also want to talk about my own experience.
Well I've never actually seen what I would consider to be a ghost before, but there was one occasion a few years ago when I felt like I was in the presence of many, and I've never felt that way before. This was when I used to live in England, and I used to have very weird sleeping patterns all the time, so I'd be up all night often. Sometimes I'd go out in the middle of the night and take the 15-minute walk up to the petrol station to buy snacks and drinks, I wasn't scared of the dark (though I did find it too gloomy and don't really like being in the dark, I'm the same these days. But it never bothered me much)
Anyway, I'm on my way back. It's very very quiet as always, at night the streets around there were completely deserted, I didn't even see many people in the daytime. But I suddenly feel like I am being watched and followed. I'm not a paranoid person at all, and I'd taken this walk many times at night and felt fine. I kept looking behind me and around me, and walking more hurriedly. But it got worse, I felt like many eyes were on me and watching me, and I felt fear as though I could tell I was about to be attacked, even though there was no logical reason why I would be. I couldn't see or hear anything out of the ordinary, but I just felt this horrible coldness and fear, and every fiber of my being was telling me to get out of there, NOW. Well I ended up RUNNING home as fast as possible, however when I got home I didn't feel much better. I was home alone at the time (I think my family might have been away for a weekend and I didn't go), I turned all the lights on and I still felt exactly the same. Well I ended up sitting in my room in a corner sobbing until the feeling went away (an hour later).
You can write it down to being a simple panic attack or whatever, but there was nothing to cause it to happen, and I'm usually a very stable and sane person, even when I was that age. But at that moment I was positive I was in the presence of many 'people' who meant harm to me.