Devil Box is Ominous to your spectator's mind!

First, you take the deck of cards out of the card box and hand the deck to the spectator to shuffle. Next, you invite a spectator to pick any card and sign it. The signed card is then lost into the deck, After that, you put the card box on top of the deck and with a magical shake, the signed card has jumped into the box.

Finally, you pick up the box with your empty hands, open the card case and show that the signed card has appeared inside the box! The signed card is then taken out of the box!! Spectator sees the card inside the box before the signed card is removed!!!

Finally, spectator can examine the card box, signed card and the deck.