1974 Lamborghini Bravo ConceptDel Stewart

Seems to me that pretty much any science fiction movie from the 1970's that predicted what cars of the 2000's would look like based their predictions off of this car.  It looks a bit like the first stealth fighter, the F117, but car design mercifully moved a different direction. Except maybe the very angular Cadillacs. 

Designed by Bertone, which had a long and influential angular period.