A few weeks ago, a girl I know was on her way to campus and stopped to go through a Burger King drive through. As she sat in line to place her order, she noticed the car in front of her (whose driver had been ordering) backing up. She tapped on her horn to let the driver know that she was behind her. After all, she didn't want to get hit because the driver wasn't paying enough attention to check the rear view first. The reversing driver took exception to this. She leaned very far out her window and screamed, "Back up, Bitch!"
The girl I know backed up and gave her enough room to maneuver her way out of line. Irritated by the other woman's response, she said, "They take credit you broke whore." as the other woman drove past her.
That's quite possibly one of the best things I've ever heard of someone saying to a complete stranger. However, I wouldn't recommend it (especially in this town where there's been a 32% increase in violent crime).
Apparently the woman was infuriated enough to drive around to the front and wait for the girl I know to come through the other end of the drive through where she tried to get her to get out of the car and fight. Right there in the parking lot. Of course, the girl I know just drove off, but it still makes for a good story.
And you thought living in your town was interesting.