Caution: This comment contains mildly infuriating party tricks.
Curious. This reminds me of the "Your tongue knows what things you look at will feel like" meme that did the rounds a while back. (If you missed it, it was literally that phrase, possibly with some kind of image.)
Reading the article, it also reminds me of the body confusion trick of moving the right foot around in a clockwise motion while trying to write the letter O a few times (which most people write anticlockwise). Most people will inadvertently reverse the rotation of their foot.
(Make necessary changes if you're left handed and/or write your O's clockwise.)
Or the two hands equivalent: Pointing away from yourself, move the tips of the index fingers around in a clockwise or anticlockwise motion, keeping the fingers parallel. Then, continuing the rotation, turn the hands inwards so that they point towards each other. If they're now both going over and away or over and towards, one of them has changed direction.
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