The Chevy Astro I concept:
(Thanks, kanadanmajava1) This was a car where it appears that you enter by crawling under the hood. And it was beautiful.
The Chevy Astro II Concept:
This was one of the cars that started rumors of mid-engined Corvettes. Pretty neat.
The Chevy Astro III Concept:
It was basically a three-wheeler, but the front tire was a dually, giving it four tires. It also had a lifting canopy and a turbine engine, plus headlights that pop out of the sides!
The production Chevy Astro:
Proof that the production car is never as cool as the concept...