The scooter engined Iso Isetta bubble car. http://en.wikipedia.org/wiki/Isetta
The Isetta was also manufactured by BMW under licence.
The BMW Isetta (yes, boys and girls, this is a BMW):
Bubble cars became popular when the Suez Crisis during the 50s caused an oil shortage. The British Motor Corporation came up with the Austin Mini to counter the bubble cars.
“God damn these bloody awful bubble cars. We must drive them off the streets by designing a proper small car”. Leonard Lord, president of BMC.