I'd love to hear from people that have done one, what happened?
I wouldn't ever do one but I can't get over always thinking that somebody in the group must be pushing the arrow instead of it "guiding" you
When I was about fifteen a girl in my Science class suddenly stood up and started screaming. It turned out that she'd done a ouija board a few days before and had seen something/somebody in the classroom and then freaked out
I think there's certain things you shouldn't mess with and that this is one of them. Too big a risk