Since I have voted I have seen a ghost, It is only right to share my stories.
1) (not exactly a ghost, more like orbs) While on a family trip to the Dakotas to visit Mount Rushmore we were staying in this really nice hotel. Well once night as My 2 brothers shared a bed and I laying on the floor I was looking up on the ceiling when all teh sudden through a wall, was about a 2in diameter sphereical ball of light. It floated there for a moment and then moved about the room in an odd fasion. Much like a Bee flying around, where its no straight path and zig zagging a bit. I even saw it drop altitude a bit and then finall yraise back up and leave out through the ceiling.
2) [Ghost 1] I was 13 years old, in my bed at night. As I laid there I had to quickly go restroom. (parents were still not in bed) Went restroom, came back to bed and laid down. After a few moments I looked up at my open closest door and there was a white-shadowy overset women (similar size of my mother) looking in my closet as if searching for something. I thought it was my mom so I called out "hey" "hey. mom." "Mom what are you doing" getting louder and louder. Finally I grabbed my Pillow and tossed it at her, in which as it went through her she dissappeared. A minute later my mom came running up asking "what's wrong?" --- A week later I did some research and turned out a years before we purchased it a heavyset women about 40yrs old passed away in that condo we lived in.
3) [Ghost 2] I worked at an amusement park (and it shall not be named), on the train that passengers rode. One night as I was on the back of the train riding at night ensuring passangers behaved themselves, I turned around and on the track about 50yards away, something was chasing teh train. It looked like a little 5-6yr old girl wearing a poka dot dress. She seemed smokey like. After chasing teh train for about 15-20s, she darted off and through a wooden door into a pumphouse that supplies pumped water for the water ride nearby.
I was also told as a baby, my parents would hear me try to talk in my crib standing off just starring off in a general direction for minutes, and it was hard to break my concentration. Even sometimes reaching my hand out trying to point or reach towards something not there.
(Fyi I do believe in ghosts, but not ghosts being that of dead people. I believe "information" of events can be stored in an area if the emotions are there much like electrons can hold onto information while in a molecule. I also can say it would be somewhat likely if it was a small weakening between another really close dimension (obviously very similar to reality is closer than a dimension in which many things are different) in which we have the chance to "see it slightly".
And for the record I have predicted the future 8-10 times in my life approximately 4-5 minutes before something happened, exactly in detail, when i get this odd chill feeling in the back of my spine. If you want to add more mystery to me. (Though when i get these feelings are unpredictable)