Jaguar has had to recall over 17,000 diesel X-Types over an error in the code that controls cruise control. The bug affects cars that rolled off the line between 2006 and 2010, and can prevent the system from disengaging.
Although it's not as bad as a Prius that accelerates by itself, not being able to break out of cruise control is a really scary thought. If your car is afflicted by the bug, the only way to gain control again is to turn off the engine. The "potential problem" was spotted by a Jaguar employee, so thankfully the bug hasn't caused an issue thus far -- at least that we know of. [The Register]