[GingisK]

Maybe the dimensions of that particular manufacturing run were out of tolerance...

Contact is not made through the Ouija board. Contact is made through your mind. You mind is "slaved" to move the pointer in an involuntary fashion. Often on person cannot be controlled with sufficient strength to make the pointer move. Several people can be influenced at once, the sum of their influences are then sufficient to move the pointer. With practice, even a single person will move the pointer; and it feels quite strong. That is when you are treading on dangerous ground.

[ZX12R]

Contact is not made through the Ouija board. Contact is made through your mind. You mind is "slaved" to move the pointer in an involuntary fashion.

Then why doesn't it happen with my coffee mug sitting on a newspaper?

Often on(e) person cannot be controlled with sufficient strength to make the pointer move. Several people can be influenced at once, the sum of their influences are then sufficient to move the pointer.

Influenced by their imaginations, maybe.

That is when you are treading on dangerous ground.

If you really believe that, then I can see why you'd avoid using one. But I know there's nothing to it whatsoever. Completely imagined superstitious hokum.