Imagine you're side by side with a guy in two checkout lines and by chance you have the same 6 items. Both of you get rung up and it comes out to $100 on the display. At that point, you reach for your card. The other guy though, reaches over to the cashier and does a wiggly weird handshake. The cashier smiles knowingly, hits a button and boom it says $86. You've got no recourse to complain. The items you picked up were clearly marked and you accepted the total amount. You start to notice how every 5th person does the goofy weird handshake? Feel like shopping there again next time?