"What would you do?"
A customer rushes into Walmart with a sick child at home. She grabs a couple of items and asks for and receives what she came for - a special item from behind the counter of the pharmacy - medicine for her child.
The check-out lines are busy and finally it is her turn. The woman places her 5 items on the belt and the cashier flies them over the sensor.
Hearing the odd beep the cashier runs the last product she had in her hand over the sensor again.
Looking at the screen both costumer and cashier realize now that item has been charged twice. The cashier removes the error and runs the last item through.
The customer immediately realizes what happened. The medicine is what caused the weird sound from the register, not the product that had been rung in twice. There must not be a bar code on the medicine. The medicine itself would make the bill at least three times more.
All of this is figured out by the costumer in the matter of a second. Her decision happens in the next second...
What would you do?