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Put the palm of your hand on top of your head and do a "what the HELL are you talking about" face where you furrow your brow and squint. For some people at least, the scalp will involuntarily move forward as part of that expression. One can learn to do it voluntarily.
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The muscles involved can only push the scalp forward, so the "trick" behind the joke is that the "I wonder if it's in place" expression is an excuse to push the scalp forward. Then you relax it and move your hand back at the same time, as if pulling it.
End of conversation
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