turn over card secret

effect : a chosen card reverse itself in the pack.

Secret : spread the cards face down and ask a spectator to take any card. While he is showing the card to the rest of the audience. Secretly reverse the bottom card them turn the whole pack over in your hands. Walk towards the spactatorand ask him to replace his card in the pack face down.
As yo walk back to your table, turn reversed card face up and turn over the whole pack again. All the card are now face down with the excetion of one card - the one the spectator chose.

This top card has been secretly reversed

chosen card