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Think You're Good At Paying Attention? This Video May Make You Think Twice

If you consider yourself an observant person, it won't be hard for you to count how many red cards are in a stack, right?

BuzzFeed Blue's selective attention test measures just how well you pay attention. It seems easy enough, but watch out, because you're in for a little surprise at the end.

Happy card counting -- and don't say we didn't warn you!

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