BMW's GINA concept car today got us to thinking about concept cars in general. They exist at the inflection point where our dreams and technology meet. Whether we yearn for nuclear power, extreme performance or phallic shapes, we have the concept car to thank for pointing us toward the uncertain future. And while not all concept cars see the light of day, the automotive wishes of yesterday often influence the driving realities of today. With the help of some of our readers, we've put together a top ten list of what we believe are the most insane concept cars ever created. We'll leave it to you to pick the craziest in the poll below.