Last year for our LBC club's autocross one of the member's wives rented him an Elise--he let anyone who wanted to take it for one spin, what a hoot, pretty much a race car for the road.
It was from one of the major rental chains, apparently they had two available, the other was in the shop, makes you wonder what sort of maintenance charges they have on these, tires, brakes, I mean, I don't think people rent these to go get groceries, or because their Taurus is in the shop.