From Wayne Kawamoto,
Your Guide to Magic & Illusion.
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Effect: The spectator selects a card and places it back into the deck. After placing the deck behind your back and bringing it out again, the selected card is shown to have reversed itself in the deck.

Secret: You have secretly reversed the top card so the deck looks as if it’s face-down when it’s really face-up. When the spectator places his or her card back into the deck, the selected card is reversed and facing the other way.

When noone is around, prepare the deck by reversing the bottom card so it’s facing the other way. Note that the picture above is strictly for explanation. As you perform the trick, the spectator should never notice that the bottom card is reversed.