Depends on how they program the machine. I swear this one self check out machine literally had me follow its steps in order for it to process it correctly, then when I grabbed a plastic bag before step 13 insert items into plastic bag the thing short circuited. But even still, it is isn't rocket science. Scan the barcode, put in your credit card and get the heck out.

I don't know about you guys, but I swear there are those that dont realize that the scanner is scanning the barcode and doesn't just "know" you have a box of twinkies because you are waving the front of the box around the scanner.