CAN YOU SOLVE THIS MYSTERY?

I definitely DO NOT believe in magic but this is too cool! It has to be in the computer coding but I can't explain it. Do any of you techno heads out there know how this works. I may have to call on my son or grandsons to explain this to Granny! 

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MY FRIEND IN GLASGOW, SCOTLAND SENT THIS TO ME. I CAN'T FIGURE IT OUT. CAN YOU? TRY THIS OVER AND OVER USING DIFFERENT CARDS, IT WORKS EVERY TIME. MAYBE IT IS PROGRAMED TO KNOW THE LAST CARD YOU LOOKED AT…SPOOKY!