I had the delightful experience of my son being given a hot dog that already had a bite out of it last night...!
Incredibly, this is the second time we've had the "pre-owned" food experience at The Amex - last year with a pie that had been part eaten, returned, and somehow ended up back in...
I hope the kiosk assistant replied by saying something along the lines of "Of course you may have the 3 for £9 deal but I'm afraid you need to stay on that side of the counter while I fetch the items for you".