Auto tills had some redeeming features...
... back in my student days, a mate of mine who worked at Big Supermarket Chain TM discovered that the job destroying tills would accept ANY money off vouchers from the free magazine, regardless of whether they applied to the items in your shopping basket or not. Vouchers on toilet roll, Shampoo and crisps would give a bill reduction on a basket of Vodka, toffee and Super Noodles. If I recall correctly there was a brief period where he could do his weekly shop for £1.