You invite a man and a woman to participate in this experiment. Position the man and woman standing facing each other and instruct the man to lift the woman by placing his hands under her armpits. He will successfully lift her.
You then wave a hand in front of the man's face and suggest to him that the next time he tries to lift her, he will find it more difficult. The man tries to lift her again and sure enough, this time he struggles to lift her.
This effect looks like hypnosis but actually relies on a principle of mechanics to work.
The first time the man lifts the woman, have them standing quite close together so the man's arms are bent when lifting her. After the first lift, step between them, stand in front of the man and perform your pseudo-hypnosis as follows.
Waving your hand in front of his face, say
"OK, just close your eyes for a moment"
"In a moment I'm going to ask you to try lifting this lady again. On this next attempt, you will find it much more difficult."
Tap your forefinger on his forehead and say
"OK open your eyes and try lifting her again."
Here comes the most important part of this effect. Gently guide the pair into position, with the man and woman twice further apart than before.
This time the man will need to extend his arms more to lift her. Twice the difference means double the effort. So even if he can still lift her, he will find it more difficult. You wording has been sufficiently vague ("you will find it much more difficult") that whether he lifts her or not, both outcomes are valid.
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