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1
Tell your audience member to rest their finger on the full moon on the back of your shirt.
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2
Tell them to think of a number between 5 and 20.
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3
Tell them to count that number clockwise around the circle of planets — number 1 would be the half-moon, 2 the crescent moon, 3 Earth, 4 Neptune, and so on — until they land on a planet at their chosen number.
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4
Now tell them to count that same number counterclockwise around the circle until they land on a different planet — ignoring the moons this time.
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5
Assuming they've followed your instructions exactly, they will always land on Mars — but don't tell them you know that!
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6
Now ask them to scan the QR code on the sun with their phone. When they do, it will pull up a webpage "reading their mind" and telling them they are on Mars!