I thought I saw a ghost when I was younger. In fact I saw it multiple times. However I was only a little kid at the time, and it happened at night. I can't rule out the possibility of a false awakening in which I saw the ghost. I would of sworn I was awake every time I saw it, but I didn't know as much about dreaming back then as I do now. So even though it seemed like a credible experience I am going to discount it for the more likely situation, that I was dreaming.

I really don't believe in ghosts and stuff. So much of the stuff is explainable, and there is still no solid proof. People don't really get ghosts on tape and stuff, and there is no reason for why they shouldn't be able to. I believe most ghosts are just the natural human ability to pick patterns out of random shapes. That is why so often its a shadow or strange light. People see stuff like that, and their mind forms that random shape, that may be human like into a ghost. When in reality its just a random shape. Same for voice recordings of ghosts and stuff, and people seeing Jesus face in dirt and stuff.

As for an afterlife, I do believe in one. Theoretically if time is infinite everything that has occurred will eventually occur again. This includes atoms coming together to form your brain. In fact, given enough time, there is a chance of every particle in your body reforming as it is, at this exact moment. Even if this takes an infinitely long time, it doesn't matter. So worse case scenario if you wait an infinitely long time, you should eventually be reborn.