DF and I joined a line of people in the express lane at Wal-Mart. The lady before us had 2 items, we had about 13. When it was time for the lady to pay, she presented to the cashier what looked like a paycheck and asked if she could pay with that. Approximately 6 minutes later, it was determined that she could not*. However, that was not made readily apparent to anyone but her and the cashier because we were still standing there waiting. Finally, about 8 minutes into her having begun her transaction, DF offers to pay for her stuff because he and I both thought that check was the only thing with which she had to pay. She declined the offer and produced cash to pay for her $10 worth of items. All in all, her 2 item transaction took ~10 minutes. So much for the express lane.
*A manager had come back with the check and the cashier was still holding it as she spoke to the lady.