The Balanced-Over-Batteries, or B.O.B car is an ingenious contraption developed by Robert Lange, a retired auto mechanic from California.
The B.O.B car was designed following the example of skateboard trucks which use the tilting movement of the board to adjust the angle of the wheels, therefore providing the ability to steer. The vehicle gets its name from the fact the batteries are slung underneath the single passenger cockpit. During cornering the batteries act as a counterbalance to the leaning of the vehicle's passenger compartment - up to 45 degrees in tight turns! This clever balancing act means that no power steering is needed and the steering wheel can be turned easily from side-to-side with the palm of the hand.
Full article in the link (total cost of materials $500!)