Yes, just silly fun that some gullible folks scare themselves over.
The Ouija board is a kid's game sold at Toys R Us, and it doesn't conjure spirits any more than Hungry Hungry Hippos conjures real hippopotamuses. There's a lot of myth and hype surrounding this board since many people are easily fooled and would rather buy into the hype than consider this with a critical eye. It works based on the ideomotor effect -- subconsciously you are pushing on the pointer in the direction of the letter you think the "spirit" is spelling. And it works much better with multiple players, since when a few letters are already spelled everybody tends to home in on the same word -- the players are pushing the pointer, not a spirit. And when everybody is pushing the pointer, the illusion is that no one is pushing on it. That's it, that's the whole gag. It fools lots of teenagers, and embarrassingly enough it fools some gullible adults too.
And don't forget to take into account the jokers -- the players who intentionally move the pointer, or the ones that rigged something to fall or tip over during the Ouija session (a little black thread in a dark room can be pretty effective for that). Or just say "hey,I see a black shadow in that corner!" -- everybody will look, and that's your cue to fling the pointer across the room and say a demon did it. This kind of stuff is what Ouija board sessions are all about.
http://web.randi.org/swift/yes-no-goodby...
http://www.straightdope.com/columns/read...
http://www.skepdic.com/ideomotor.html
Penn & Teller debunk the Ouija board:
http://www.youtube.com/watch?v=ykvd__Wv9po
Ouija boards reveleaed:
http://youtu.be/cma5Zn7xrWU
DNews ouija boards:
http://youtu.be/221lInw7Wj0
NatGeo blindfolds Ouija players:
http://youtu.be/PRo8TytvIDw