During the scene where the Milenium Falcon was attached to the back of the Star Destroyer, they show an inside-the-cockpit view of the Falcon in which we see Han, Leia, and C-3PO discussing there options. C-3PO is complaining as usual, and then Leia shuts him off. If you look closely, you can see the shut-down C-3PO breathing during the entire scene that Leia and Han interact. (I never noticed this on the television before, it wasn't until I saw the Special Edition in the theater)