OK, call me gullible if you like, but I would never touch a ouija board, because of something that happened to one of my mother's friends 30 years ago. I wasn't there when they played with the board, but I did see a lot of the things that followed. I was 12 at the time and still remember it very vividly.
The friend's two daughters and two of their friends made a ouija board from letters written on paper, and started messing around with it. The glass started spelling out "death" over and over again, they all denied pushing it, and the glass moved faster and faster. They got frightened and took their hands from the glass, and it carried on moving on its own, still spelling out the same word. One of the daughters tried to grab the glass but she couldn't, and she had to knock the table over to stop it.
For weeks, at the same time every afternoon, the house would go stone cold (this was the middle of Summer, during the school holidays), and an ornament on the mantlepiece would fall to the floor. I saw this myself more than once. One awful thing after another happened to this family, including the sudden death of the husband, until one day my mum's friend told us that the ornament had thrown itself across the room and hit her head. I don't know what the truth of that was, but she certainly had a nasty head wound from something. My mum told her friend to burn the ornament. She did, and I swear that ornament screamed as she burned it. Their bad luck stopped.
How much of that is auto-suggestion, I don't know. But it freaked me out enough that I would never, ever go near a ouija board, even now.