At least I am pretty sure he was lying.
I was packing shopping into the trolley as had left bags in teh car, DD's were busy poking the buttons on the pin pad thingy, which they do a lot
Grumpy checkout man says 'you need to stop them doing that, they just pressed a button and it meant you have 2 of these bottles on your shopping now, I've got to delete one'
I said that it didn't affect teh shopping, but if he wanted them to stop then they would but he was insistent that every time they pressed it it added that multiple of the shopping onto my bill and he woudl have to fix it.
He was wrong wasn't he? and if they were pissing him off then fine, say 'stop them, that is annoying me' and I would have moved them, but to make up sucha random lie?