That "honor" goes to Consumer Reports and their brand new Fisker Karma, which broke down during calibration tests, just a few days into CR's ownership period. After the dashboard flashed a warning, the driver stopped to see what was wrong, and then couldn't get the PHEV into gear again. Self-repairs (i.e., let's leave it alone for an hour and see what happens) didn't work and the manual was no help, so the nearby dealer sent out a flatbed truck to haul the Karma away. As CR writes:
The Karma's problems are widespread. It has been plagued by a variety of problems, including two recalls, one for a software glitch and one for battery issues, following a long delay getting the car to market. Owners commenting on the FiskerBuzz forum are also reporting various issues. Not exactly behavior that leads to a "Recommended" rating.
We buy about 80 cars a year and this is the first time in memory that we have had a car that is undriveable before it has finished our check-in process.