I saw this on TopGear once, when they displayed what they thought to be the "10 Most Amazing Cars." This is quite unique, like all the others. The one at #1 was what you would call an "aquacar." I don't remember the actual term they used. Anyways, it could basically drive on both land and water. =P
pretty practical if you ask me. when you are driving alone, why haul all that space and air? shrink it ... maybe it'll save me some gas.