Here's a smart and awesome idea: Tesco Home Plus, a grocery chain in Korea, devised a way for people to buy groceries while waiting for the subway. They've created graphics that look like supermarket aisles along the station walls. People can use their phones to scan QR codes printed on each "item" in the aisle, which adds the item to their cart. They can then pay and have their groceries delivered to their house. It's like FreshDirect on steroids!
Tesco's argument is that because Koreans are hard workers, they have little time to do their grocery shopping. This system allows for an efficient use of time. Read more here.