GingisK has posted the most authoritative "scientific" experience of the Ouija Board. Though highly educated, I do not pretend to compare my experience with his but do check out my post at #65.
Oh, dang! I meant to respond to that one. I got lost in the shuffle.
Yes, I have no doubt that your experience was genuine. I'm not sure that Satan is the influence in any of this. I got the impression those spirits enjoyed and perhaps fed on emotion. They often tried to induce fear. I notice that a lot of the 2012 kind of scares seems to be a favorite theme with those critters.
Edgar Cayce spoke of Ouija spirits, and not kindly. Many believe contact with them can be a precursor to spiritual possession. I developed rather frightening dreams, which were dispelled only through fervent prayer and abandoning that bad practice.
On the bright side, I am absolutely sure of the existence of life-after-death and a spiritual existence. It is more complicated "over there" than in real life. I'm not so sure that any current religion has this stuff figured out. Consistent with the short period of time we have had "high technology", I am confident that mankind knows very little about physics or the Universe. We are indeed sheep.