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It's easy.

The cards displayed after the click, regardless of which eye you click on, are different than the ones you chose from. It's a completely different set of cards so no matter which card you chose, it is guaranteed not to be in the "answer" cards.

Exactly. It's the old misdirection, nothing up my sleeve move. It's too funny. I posted this earlier on the wrong blogpost. I posted it in the past of the year 2004. http://browsermetrics.blogspot.com/2004/08/whats-trick-here.html How's that for a hat trick?

Here's what I posted:
That's too funny. It's complete BS. Look at the cards. Hehe.

At first I was like neat, but then I looked closer... wait a minute... Heh. Pretty funny.