For one Subway customer, it wasn’t the amount that mattered, it was the principle. “You can round up, but you shouldn’t be rounding down on the change you need to give your customer,” she wrote. Morehouse says she responded that the store’s lack of pennies wasn’t the customer’s responsibility and suggested checking another till instead. For Morehouse, that explanation didn’t change the situation. Some customers may have let the four cents go without a second thought, especially if an employee explained the situation.