via The Nerdist:
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Two factors are at play when using an Ouija board: A strong subconscious need for an answer to a question and a phenomenon known as the ideomotor effect.
The ideomotor effect says that people can move or move something without their conscious mind realizing it. In the case of the Ouija board, if you really want the answer to a question to be yes and your partner knows it, you could both push the planchette to “YES” without either of you consciously applying any force. (And if you think you can ever keep your hands completely still, try keeping a laser pointer’s dot perfectly motionless.)
You can test this effect for yourself. Find a string and tie something moderately heavy to it. Extend your arm and hold the string and hanging object as still as possible. Now imagine the object moving in a circle.