For some reason this made me thing of http://en.wikipedia.org/wiki/CueCat
Yes, if you throw away your box for your granola bars, you might not have the bar code handy, but it was at least there when you bought it in the store.
Possibly a case of doing one thing wrong that ruined the entire product. We'll see.
And the industrial design! It was a chintzy elongated white plastic cat, with an IR window across the mouth. And it was finicky as hell to use, compared to a real barcode scanner.