A blonde goes to her psychologist and says,

“I’m on the road a lot, and my clients are complaining that they can never reach me.”

The psychologist asks, “Don’t you have a phone in your car?”

The blonde replies, “That was a little bit expensive, so I put a mailbox in my car.”

“So is that working?” Asks the psychologist.

“Actually, I haven’t got any letters yet.” Answers the blonde.

The psychologist, “And why do you think that is?”

The blonde, “I figure it’s because when I’m driving around, my zip code keeps changing.”