This is a fantastic mentalist trick where you can easily and powerfully demonstrate your ability to mentally project simple thoughts into the mind of your subject. This illusion uses a simple deck of cards, and some set up beforehand, as well as some decent patter. Since the patter is only used for mental misdirection, you can talk about any old thing and it will work fantastically.
Here's how the deception will appear to your soon to be very overwhelmed test subject. You tell them you have a deck of cards, and you will get each card off the top, and think on the color, red or black. Then you will propel the color into their brain, and they will mindlessly choose the right color. You precisely go through the whole deck, projecting either black or red into their intelligence.
When you are finished, you will have two stacks of cards. Every time they guess red, you put the cards to the left, and every time they guess black, you put the cards to the right. You clarify to them that based on to the laws of statistics, two or three in a row is arbitrary chance, but more than five or six in a row is confirmation of something deeper, something inexplicable. You ask them to decide on which to check first, black or red. Then pick up whichever stack is that color, and ask them how many cards in a row would persuade them of your powers. Usually they'll say somewhere between five and ten.
You then carry on to flip ten cards over, all the exact color that they predicted. You have established your aptitude to overpoweringly project your thoughts into their brain, and they will never look at you the same way again.
Here's how to do the trick. Earlier, you'll need to isolated out all the red and black cards, put them into the deck. So you'll have 26 black cards on top of 26 red cards. When you are "projecting" the card color into their brain, you'll go through all the black cards, and all of the red cards. Since they'll likely choose arbitrarily between black and red, after the first half the trick is over, you'll have two stacks, with black on top of red, on either side.
They, of course, will think one stack is completely black, and one stack is totally red. So when you ask them which stack they'd like to look at first, just memorize which color is on top. If they choose red, display them ten cards in a row from the bottom, and if they choose black, exhibit them ten cards in a row from the top. You'll need to be chatting when you pick up the precise stack, and turn it over in your hands a couple times to keep their concentration off which side of the stack you pull the cards from. This trick always amazes them, and will sway any skeptic beyond a shadow of a doubt of your supernatural projection abilities. Have fun.
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