The VW Microbus, also called the Transporter or just Bus. They were rear engine, four cylinder air cooled Volkswagens. Engines very similar to the Type I but squished down. Sometimes called pancake engines. Production went from the early 1950's to 1979.

They're not the safest vehicle in the world, considering there's about an inch of metal between you and the road. If you get in a head on collision, count on broken legs. However, they're remarkably fun to drive, as long as you don't have to parallel park.