If General Motors aired a commercial showing a stationary car, and some bouncing objects, my default reaction is not to go to a Chevrolet dealer to ask further questions. My default reaction is probably a non-reaction, which is to quickly forget what I just saw -- or more accurately, what I didn't see.
Come to think of it, perhaps General Motors is using a similar ad agency?: http://www.youtube.com/watch?v=k_OfzaZcz9Q