Pick one card out of a deck and show it to a group of friends. Give the card to them to let them study it and see that there is nothing special about the card.
Hold out one hand so that it is completely level and place the card on that hand. Place the very center of the card directly between the divide between the little finger and ring finger.
Place your other hand directly underneath the card hand so that they are touching. Make sure both hands are low to the ground so that nobody can see the bottom of your hands.
Position the little finger of your free hand in the center of the card between your little finger and ring finger. Make sure that nobody sees you do this.
Push up on the center of the card slowly while making sure your hands don't move. This will make the card appear to levitate. Move the card slowly up and down to make it appear to move on its own without strings.
Lower the card back down onto your hand.