I do the water and sewer billing for a small city in Washington state. Customers complained about our postcard-sized bills, which they said looked too much like junk mail. So we decided to start sending full-sized bills in envelopes. The month before the switch, I had a note printed on the cards, announcing the change.
Two days later, I heard someone yelling at our receptionist, "Is this some kind of joke?" When the customer threw his bill upon the desk, I saw his point.
The note was, "Coming Soon! New Larger Bills!"