Impaired . . .

It was about eleven o'clock one evening and I was driving home in my cute little light blue two door coupe with my sunroof open. I was in the passing lane and the first car stopped at a red light. There was a BMW beside me and an older pickup truck behind the BMW. It was a quiet Texas evening and not many cars were on the road. I can't really recall what made me look up, but I did. There, in my rearview mirror, I see . . .