The scene is from the 2004 movie Downfall, and it has been spoofed before, just not in a way relating to the automobile scene. After the dictator acts pleased about releasing the Camaro ZL1 at the L.A. Auto Show, he is informed that the Shelby Mustang GT500's specs crush what Chevy has to offer. The result is Hitler hilariously calling people dickheads, talking about car forums, and ripping on shitty Michael Bay movies. Put this one under the "shots fired" category. 

[via Top Speed]