Well, if you don’t want to spoil the “thingie”, then you might not want to read this. Read this one first: http://damnwasted.wordpress.com/2008/06/05/an-interactive-magic-trick/
Really, while it’s not too late.. just don’t read ahead if you really don’t want to spoil it.
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Okay then. The trick is that the card from the second set isn’t the same with the first set.
Conclusion: It’s a big FUCK UP!