QR codes track vegetable quality.

These days, Japanese housewives aren't just buying any vegetable. They're using QR codes to track the path of the eggplant on display to see if it's locally grown, organic, and priced right. Treehugger writes:

After a breakout of Mad Cow in 2001, Japan's Food Safety Commission began to tag more and more foods with radio frequency or QR tags that contain information on the origin of foods.

When you first step foot in a Japanese supermarket, you might be surprised at how expensive produce is. But everything is so much fresher that I think it's probably worth the price difference. You might only be able to afford one meal instead of two, but at least you know you're not having pesticide-and-beans for dinner. Link