Want to know if you can be sued if you leave the keys to your car in the ignition and someone steals your car and runs over someone? Then read this opinion. It's a very good, and comprehensive, discussion of the issue by Justice Hill. I'm glad he decided to publish it. (Justice Hill, by the way, is a relative newbie to the Court of Appeal, having been appointed earlier this year. Welcome!)
The answer, by the way, is -- at a very superficial level -- "No, unless your car is a bulldozer, and maybe the California Supreme Court should revisit this rule." Read the opinion for more details.