Why is a Trabant the quietest vehicle?
   Because your knees are pushed up over your ears.

Why is a Trabant the longest car?
   There's ten feet of car, followed by 50 feet of smoke.

A rich American was competing with his friends for a collection of the
  world's biggest and best cars.  He and his friends had their garages full
  of Mercedes, Rolls, Alfa Romeo's, Jaguar's, and more, so when he heard of
  this vehicle called a Trabant he had to order one, since none of his friends
  had one.  When the Trabi arrived on the ship in a big box, the American
  showed up with all of his friends for the unveiling.  The box front was
  opened up, the servant went inside and drove out the tiny car.   "Look",
  cried the American, "they sent over a working model first!"


Yugo joke:
  
Why does the Yugo have defrosters on the rear window?
   To keep your hands warm when push-starting the car.  (This isn't a Trabi joke,
   because Trabi's don't even have the defrosters).