It seems like every month that companies are figuring out new and innovative ways to advertise their products. Most recently have been the QR codes. QR codes are now customized, and are found in a number of different places.
Guinness has come up with an idea to put their QR code on a glass of beer. The QR code does not show up unless a dark colored beer is in the glass. Furthermore, when you are at a bar raising your glass, you can easily scan the QR code to get all the information about the product you need.