You'll mock them for John Edward and those ghost hunting shows or for believing in ghosts in general? I'm right there with ya for the former, they're scams to take money from gullible people, though I don't think mocking people who believe in them is the right thing to do. You have to remember that, at least in the case of John Edward, the audience are people who have lost someone, whether years ago or just recently and as such, they open themselves up to the man because they want to believe they can communicate with a lost one.
On the topic of ghosts in general, I can only give my own experience. When I was around 5 or 6...maybe 7, myself and my brother were in the abandoned house next door. It was the middle of the day. As young lads do, we were being a bit destructive. With our father's sledgehammers in hand, we were banging old stone out of the wall of what I presume was at one point a woodshed. Deciding we'd be a bit more destructive, we entered the house to break the plaster off the inside walls. We stepped into the house from the back door that would have led to the kitchen. the door faced a wide window and shafts of sunlight penetrated through the dusty glass.
There was something else there in the light as well however. It was the image of an old woman dressed in black, standing around the midway point of the room, facing us. My brother and I both saw her. The first thought that crossed my young mind was that this was some neighbour that had caught us in the act and we were going to be in trouble. We both ran, but not before we realised that the woman, while we could make out the details of her dark dress and curly hair, could be seen through and the window was visible, the shafts of light going through her.
When we returned home, we ran to our father and told him what happened. The conversation went something like this.
"We saw someone in the old house"
"Yeah, we could see through her!"
"We saw a ghost, daddy!"
"You're imagining things, it was probably just a trick of the light."
For a few years, I went on believing that and my brother, still to this day, dismisses it as such. However, when I was older, maybe about 10 or 11, I found some old photo albums in the closet and began going through them. I saw wedding photos, photos of my father looking quite stoned, from the 70's, poking his head out of a tent and giving the peace sign and then I saw this older, small, black and white picture of a woman in a black dress with dark curly hair. It was the same woman I had seen on that day and when I showed the picture to my mother and asked her who she was, my mother said "That's black nan, your great grandmother.". It had been her house we were destroying that day.
Since then, I've believed in ghosts, not quite in the way others do, but I cannot not believe now. The belief, and the lack of quality scientific evidence to back it up, flies in direct contrast to most of what I believe and I've tried many, many times to unite those contrasting views to no avail. That truly annoys me. Take it for what you will and mock me if you like but that event was burned into my mind and I doubt I'll ever discount it as "just a trick of the light."