My only experience with one was when I was 10. It was raining so hard that the teacher wouldn’t let us outside for recess, but she pulled out some board games and decks of cards so we could play indoors for recess. Then, another teacher needed her for something, so she stepped out for about 10 minutes. (I question the wisdom of leaving 24 fifth-graders unsupervised that way.)
Anyway, as soon as she stepped out, one of the kids said they had a ouija board in their backpack, and several others immediately decided he should bring it out. The summer before I’d been at a church camp where one of the instructors told horror stories about his own experiences with one, so I moved as far as I could get from it and started praying my fool head off that nothing would happen.
Nothing happened. The selector wouldn’t even move out of the empty space in the middle. It would move within that space, but the kids using it couldn’t get it to select anything. It was eventually pronounced “defective”, but I could swear the thing was watching me.