Guinness QR Cup Reveals Scannable Code When Full

This Guinness QR cup is literally activated by the product you pour into the glass, and the beer's black color fills out the code. Scan the code with your smartphone, and it "tweets about your pint, updates your Facebook status, checks you in via Foursquare, downloads coupons and promotions, invites your friends to join you, and even launches exclusive Guinness content."

Source: adweek.comAdded: 22 May 2012