I had one for a while, a 1979 Impala bought in desperation to replace my stolen 1975 Impala. It ran great but looked like someone washed it with a brillo pad.
The first week I had it, I had to twist my Mom's arm to take it to the store. She had a newish '86 Caprice and my car was in the way, so I gave her the keys and told her to just take mine. She wasn't too comfortable with the idea but did anyway and came home with a 3" gash in the paint from where a shopping cart had run into it. I wasn't exactly thrilled about that, but better in my beater than her new car.
My other story isn't as good as Johnny's, but close. Since the car looked terrible, I took great pleasure in parking next to people who were crowding the line. One day I parked next to a Lincoln Town car with maybe 6" to spare between his driver side door and my passenger side door. His car was gone when I came out of the store, so he probably swore a nice blue streak when he (or she) climbed over from the passenger side, but I'll bet he paid better attention to the lines from that point on.