I heard a voice

When I left work this evening and was driving away from the building I heard a voice. I thought that was a bit odd since I was supposed to be alone in the car. A few seconds later I heard it again and thought surely nobody is in here. I turned on the light in the car and looked around and I was the only one there just as I thought. Then I heard the voice again. It was a bit unnerving to hear someone talking and not know where it was coming from. Finally I figured it out when the voice said "you have reached your destination". It was the GPS. Somehow the power button got bumped in my wild driving I guess! Whew!