A bumper car, something you might see in an amusement park.

The body is a cross-section of a cylinder scaled elongated on one axis. A lot of the curved surfaces are variations of that scaled cylinder; it's nice to be able to reuse the same object in different applications. Apart from the body, the rest of the car is made of basic shapes, like a taurus for the steering wheel, with the exception of the end of the vertical bar, which is a sweep using a circular wire.