I was going to go for Rocky's driving montage just after Apollo dies in Rocky 4. However I think it's pipped to the post by the start of Rocky 3.
It begins with rocky winning loads of fights but you see Mr. T looking angry in the crowd. Then it changes to Mr. T beating the crap out of everyone and shouting about how he wants to fight Balboa, whilst it shows Rocky just living up the high life. Set's up the film superbly.
First sensible thing I've ever seen you write!
Bang on the money with that one though.