There should be a fucking competency exam for the self-checkout line at the grocery store. If you're trying to scan your "Coinstar":http://coinstar.com/ reciept as a "coupon", and the clear female voice is telling you that it's invalid and you should press the cashier button and pay up front, that means you should push the cashier button and pay up front instead of trying to scan it 3 more times with the same dumb bovine expression on your stupid fucking cow face. </rant>