Just like that small percentage of people that can see dead people (they're out there). Unfortunately I was cursed, or "blessed" (according to my friends) with the highly developed "sense" (if you want to call it that) of feeling that someone or something watching you or standing behind your back in a room.
Its torture really and many people "wish" they could see ghosts or feel them, THEY HAVE NO IDEA, I mean I have enough with feeling them but looking at them?? No thanks
Whatever ghosts are composed of, I can feel their eerie presence whenever I enter "their" dwelling perimeter, for example a house, a room or an empty lot. maybe where they died, or they like it there?
The experience of "detecting" them is not enjoyable, you feel the hairs on your back stand on edge, an endless feeling of "goosebumps" and when those buggers decide to follow you, a heavy feeling on your back. This is experienced more during night time and when you are alone. Though if I am in a group that is fearful or fighting a lot, the feeling gets more intense.
In extreme places, when you're alone and at night, something specific starts to happen (like the rocking chair of Lorelei or the Banging on the Stairs of Mantoarms).
So if living one day of paranormal activity is enough for you, try living with it...
Oh the most intense story on me is about shadows and not ghosts, though they may be the same, we were living in our apartment in Frankfurt, it was nice and we really liked it there, until a "shadow" took the pleasure of coming out at night after the 4th month of living there, it got confidence or I don't know what.... At first Charlotte thought she was seeing things, it was quick she used to tell me. I didn't believe her, for I would've seen it or at least sensed it, but still she told me it was there. It wasn't until one night I went to the kitchen, that I saw that human-shaped dark vacuum standing right in the centre... and the street lights illuminated everything without the need of light. I couldn't turn the light on... I ran back for Charlotte and we left that night. I swear I could've burned our home down. We never came back and I sold the place. Afterwards, I made some research and found this beautiful page which made me believe I wasn't crazy lol. But yeah that was my most extreme personal story.
Happy Hauntings!
Here's the page in case you are interested, turns out they're called "Shadow People":
http://home.comcast.net/~shadowpeopleorg/shadowpeople.html