There are Erotic movies onlinesome things that you either get straight away, or you don't get at all.
The viral video below, in which Twitter user @kay_dera demonstrates a slightly mind-boggling hand swap trick, is the perfect example of this.
SEE ALSO: 16 optical illusions more fun than that damn dressPay close attention:
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Did you get it?
Well, some people had it instantly.
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Others, meanwhile, were less sure.
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For anyone still wondering what the heck is going on, here's a handy slow-mo.
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Yep: all you have to do is straighten the hand at the back, and clench the one at the front into a fist.
Now go forth and impress the world.
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