Should they be:
A) told that the big silver machine is there purely for effect, forcefully marched from the premises, and pointed in the direction of the myriad surrounding Costas and Starbucks?
B) taken outside and shot? Possibly 'falling down the stairs (officer)" on the way?
If they also want to pay on a card, then it's straight to option B, obviously. But are there ever mitigating factors which might place option A on the table as a viable warning not to do it again?