And... the customer of the day award goes to:
A lady walked in, obviously in the well-to-do range, and asked if the driveway was where she should park for the 15 minute parking?

I said no ma'am, you can't park in the driveway, we have trucks coming in all the time. She says something about "Well it doesn't go anywhere, so I thought it was OK", and seems a bit miffed as she goes back out the door. A few minutes later, there are a few different car horns sounding outside, and one of our PO box holders looks out front and tells us "She just made a U-turn in the middle of the street!"

After a little bit, she comes back up to the counter to
buy some stamps. She says "You know, the traffic out there is HORRID!"