By now, we know what Google Street View cars look like. They're Prius-esque economy cars with pole-mounted cameras attached to the roof. But the evidence suggests that until you've seen one in action, you can't be sure you'd recognize a Google Street View car in time to hide your dog while it does its duty, cover your breasts, or disguise a drug transaction. So study up on the YouTube videos of Google Street View cars in action that are embedded below. Because so far the only privacies protected by Google belong to Google VP Marissa Mayer and a horse, of course.