Guinness has a new marketing campaign that is similar to the Coors cold activated cans, but much cooler (pun not intended).  This one, instead of letting you know your beer is cold, turns on a QR code that you can scan for social media sharing.  As a long time user of QR codes I can tell you that most people don’t use them, but for those of us that do, this would be a fun conversation point at a bar.  As a note, the code in the image does not work (I tired).

Source: http://adsoftheworld.com/