A young blonde woman is speaking to her boss. "I'm on the road so
much, and my clients are complaining that they can't reach me."

"Don't you have a phone in your car?" asked her boss.

"That was a little too expensive, so I did the next best thing. I
put a mailbox in my car."

"Uh ... How's that working?"

"I don't know, actually, I haven't gotten any letters yet." the
blonde brightly responded.

"And why do you think that is?" asked her boss.

"I figure it's because when I'm driving around, my zip code keeps
changing." she said.