The most impressive thing I've seen at Aldi was a store in Germany where there were just two checkout assistants. Their right hands just flew over the keypads while the left hand pushed the goods off the end of the checkout as fast as they could

They made barcode readers look like old technology and shifted the queues in no time - that memory has stuck with me every time I see an assistant turning a product over and over looking for the code to scan, straightening the packaging passing it over the laser a couple of times before laboriously typing the number in