La carte au crayon
The magician shows a complete set of mixed cards to a spectator. The spectator cuts the deck and look at the selected card, retains it and places it in the deck, making sure to mix the cards. The magician subsequently introduced a pencil and a sheet of paper and mentions the spectator to think about the card. The magician write on the paper the card that comes to his mind but unfortunately, it is the wrong card. The magician looks perplexed by that problem. He thought for a bit and using the pencil, he managed to reveal, unexpectedly, the card picked by the spectator !