Sleight of scan

The method by which one steals items from a store by means of the self-checkout register.
Common practice includes scanning an inexpensive item while bagging a near-identical but more costly one, only partially weighing items, or otherwise misrepresenting the count.

Guy1: "Why pay 99¢ for those gourmet, grocery store bagels when a little sleight of scan can get them for the 59¢ doughnut price?"

Guy2: "Dude, seriously? It's forty cents..."