Ah thats very slick. I almost fell for it too, but I tried a little experment. I wrote down the list of cards that were displayed before you pick the card mentally, then after he "supposivly" took out my card, I also wrote down all those cards displayed as well. I looked and my list and noticed they were all completly different than the ones displayed before I had mentally chose my card. Very slick, but I got that old fart figured out. Like Hronorigger pointed out, they change.
Most interesting.