Do Ghost really exists?

I don't believe in ghosts! I think theres another explanation of any "ghost story" .. Things like infrasound, can make things move, but you don't hear the sound because of it's low frequency... And i think many of the storys is just peoples mind and believes that makes them see ghosts...

Absolutely! I've seen quite a few in my time, and most of the time someone else saw it at the same time I did. One example is that I used to work in a motel. I had seen a little boy in very distinct period clothing in the hallway. I didn't mention this to anyone, and about a week later a co-worker said she had seen something that really spooked her, and she described the little boy exactly as I had seen him. There have been numerous times when spirits have been around, though I've never had the privilege of having one speak to me.