(queue the Twilight Zone music)
Ok, I know it's a trick, but 'splain this. I usually have the browser option "Show Pictures" off so that TFL will load forums about 5 times faster. I clicked on the site AG had in the note. I read and follow the instructions, etc. Where it had the cards displayed, I saw only a blank rectangle, thinking there was probably a graphic with all 52 cards displayed. I didn't know they wanted me to pick one of their cards. I had picked the 8 of diamonds. When I got to the results screen and it said my card had been removed, I turned on the Show Pictures option and refreshed the screen. I saw 5 cards which did not include my card. I says to myself, big deal, it could have been any of 47 cards and the trick would have worked. Then I clck Back a few times to see the original screen, this time with the 6 cards showing and lo and behold, the additional card was indeed the 8 of diamonds! I still know it's a trick, but it's a good one.
BTW, I just saw the David Blaine special on ABC. He was nothing short of amazing as magicians go.