Wrecker drivers. In Houston, these a--holes will strategically position themselves (i.e., hide) near flooding areas, turn their lights off, and wait for someone to go through and get stuck. Then they'll be there to charge whatever they darn well please. I live near one of those flooding areas, so I call the cops to put up barricades. It's my way of shooting the finger at these cretins.

Thanks to the Fifth Circuit's interpretation of a law passed by Congress a few years ago regulating "motor carriers", the state of Texas and its cities no longer have the power to regulate these jerks. They can abuse customers all they want, and there isn't jack that anyone can do about them.