2 of a kind

The magician picks out two cards. He has a spectator cut the deck. He flips over the cards that he picked, and then he flips over two cards of the deck that was cut. The cards match.

PROCEDURE
Shuffle the deck so the spectator doesn´t think you have rigged it. Tell them you will pick two cards. Go through the deck making sure you look at the bottom and the top cards of the deck. Pick out the card that matches the bottom card. If the bottom card is a 4 of hearts you would pick out the 4 of diamonds to match it. Then pick out a card that is the same as the top card. Ask zhe spectator to cut the deck. Take the first card, the one on top of the original top of the deck, and flip it over. Flip the bottom half of the deck over completely. Flip over the cards you picked. And they all match!