Fun with barcodes, possibly illegal

* My friend taught me this trick. You get a barcode for, say, Apple Inc from the Internet and glue it on a can of beans at your supermarket. Then wait to see the cashier's face when she scans the can and finds out the price is US$530 billion.

I thought about this but ultimately decided that it would not work at my supermarket.

Prices at ParknShop are mark…