Following the OP:
Yes I believe in ghosts. Why? Because I've seen 2 of them in my house. When most people think of a ghost they think of a floating spirit that goes "boooo" but no.
The first ghost I seen in my house (which is over 150 years old btw) was a dude dressed in grey, tattered clothes with greasy black hair. I could never see his eyes but one time when I got home after a christmas party my bedroom light was on and as we were puling in the drive I could see a person peeping from my window upstairs at me in the car, pulling in. I went upstairs with my dad's 12 gauge shotgun. Nothing.
The second ghost I seen was a woman dressed in a red sparkle dress with no shoes, but wearing pantyhose. She had blond curles and was actually quite attractive. I saw her one day maybe 3 years ago when I was taking a piss in my bathroom. I have a mirror in my hallway leading to the bathroom and had the door wide open while pissing (because I was the only one home at the time) and when I glanced in the mirror she was sitting on the edge of my tub just watching me piss. I didn't even have time to react I just looked over, saw her in the mirror, looked back at the tub, and there was nothing there. looked back in the mirror and she was gone. very forgeted up indeed.