How to reveal the secret of the audience to the audience, but that only you can focus
 

To execute this focus, you need a deck of 32 cards. Remove from this deck one card of each suit and hide it in your pocket. Tell the audience that you are ready to share with the audience the secret of your focus. Then fold the cards face down using the method of collecting figures. This means that you put one card of each suit in the top row. Put the cards on 4 in a row. Each next row will start with the suit of the previous row, and the second card will be the same suit as the first card in the previous row and so on. After that, collect the cards in vertical rows from the bottom card to the top card, starting from the bottom right corner. The deck can be shuffled in this form as much as you like, but still, if you decompose the cards into 4 stacks, you will see that in each pile there will be 4 cards of the same suit.
The secret of the focus is the following. This focus needs to be executed quickly, lay out maps in such a way that spectators do not guess that there is any system in it. The second time you perform the trick, explain to the audience its principle and invite any viewer to focus. The spectator performs the trick and everything turns out for him. Next, invite another viewer and he will succeed. After that, say that this trick turned out, because you wanted it, but now you do not want it to turn out and invite another viewer to do it. At the moment when the spectator enters the stage, hide in the palm those 4 cards that were in your pocket and put them in the rest of the deck. The viewer begins to perform the trick and he does not get anything, because the focus is obtained only when there are 28 cards in the deck, not 32 cards. If the viewer says that there are not enough cards in the deck, give him a deck so that he counts it. Viewers can ask you to show focus again, only in your performance. Then find a way to put in a pocket one card of each suit and perform the trick. If there is no possibility to put one card of each suit in the pocket, then you perform the trick a little differently. Maps lay out as before, and collect them a little differently. Suppose that on the bottom row are the following cards: jack of spades, 10 diamonds, ace of hearts and 7 clubs. Fold the cards as follows: jack the peak put on 10 diamonds face down, 10 diamonds put on the ace of hearts, put the ace of hearts on 7 clubs. Seven clubs take place on the front side of the last right row card. Collect cards with your left hand and during the collection talk to the audience to distract attention from your hands. Perform this focus on the public can only be when you learn to blindly collect cards in the required order.