While waiting in line to buy stamps this morning, I watched the woman in front of me bring a large Flat Rate Priority Box up to the counter.

Postal Employee, weighing the box: Do you want to use a different box? This is so light it will actually cost less if we put it in another box.
Customer: No, I want to use this box. It needs to get there this week.
Postal Employee: We can use another Priority Mail box but with the weight…
Customer: No.
Postal Employee: After insurance and tracking it comes to $12.55.
Customer, angry: Why is this so expensive?
Postal Employee: That’s why I was saying we should put this in a different box.
Customer: You’re over-charging me! I’ll take this to the McLean Post Office and they’ll charge me less.

I’ll bet you anything the customer has no idea what the phrase “flat rate” actually means. I wish I could have overheard what happened at the other post office, for an encore.