You've Got No Mail

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." :)