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So easy to learn!
It almost works itself!
It's the old switcheroo game!
You'll win every time!
And you can do this one for a larger crowd!
Show your spectator two playing cards.
Put them behind your back, then take one out, with the back showing.
Ask your spectator which of the two cards he thinks it is- no matter what he says, he's WRONG!
The card he names is ALWAYS the card behind your back!
How is that possible??!!
Of course, you can perform it the other way as well.
You can handle it so that whatever card your spectator names is ALWAYS the CORRECT card!