How about being able to make your grocery purchases using your mobile phone while waiting for your bus or metro train and having them delivered home? This is what Tesco has been pioneering, with great success, in South Korea by plastering subway station walls with facsimiles of groceries, labeled with a unique code for each product.
Shoppers waiting at sub-way stations can do their home grocery shopping using their mobile phones. A mobile phone application enables people to click/scan the QR code on any displayed product in virtual storefronts at select locations. The product will then get pushed into your virtual shopping cart and get delivered when you get back home. Waiting times get converted into shopping times!