Guinnes's smart design for their glasses with QR codes : when the glass is empty you can't see anything,nor filled with normal beer ,unless filled with Black ,
murky Guinness, finally the QR code can be scanned:"it tweets about your pint, updates your facebook status, checks you in via 4 square, downloads coupons and promotions, invites your friends to join, and even launches exclusive Guiness content."Guinness QR Cup
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