A blonde is speaking to her psychiatrist. "I’m on the road a lot, and my clients are complaining that they can never reach me."
The psychiatrist asks, "Don’t you have a phone in your car?"
"That was a little too expensive, so I did the next best thing. I put a mailbox in my car.
"How’s that working?"
Actually, I haven’t gotten any letters yet," the blonde replies.
"And why do you think that is?"
The blonde says, "I figure it’s because when I’m driving around, my zip code keeps changing."