"Do you think they make them wear the underwear?" The young man said under his breath, grinning like he'd made a funny.
Overhearing him I smiled as I added up their total and replied, "It's not mandatory, but it is encouraged so we might provide personal testimony. That'll be $51.25"
The man handed over his credit card without saying anything, and neither half of the couple said anything in reply as they took their bags and left.