Insert No Bills

Hungry for Pop Tarts, I approached the lone vending machine at the train station. It was a modern, high-end one (I could tell by the blue LEDs) and naturally I was planning on paying with Good Ones. However, I did not realize it would be my only choice: flashing on the display was "insert no bills". Perhaps the machine was full of Bad Ones, or maybe the machine detected that its bill reader was busted. Regardless, it was a good day to be carrying Good Ones.