Couple of replies:
Frankie, those plastic bags are a nightmare, slyly remove a glove.
Judi, tell them you are going for petrol, motor oil, a spare bulb or windscreen wiper. Stay safe though.
and it doesn't excuse the guys dog food argument that it's more expensive at Coviran than Lidl, (which we've heard a lot of elsewhere) - if he want's to put his life (and others) at risk for a few centimos for Fido then he's already brain dead.