The Mumbling Wookiee

Han, Luke, Obi-Wan, and Chewie begin their journey to the Death Star aboard the Falcon...

...immediately Chewbacca begins to emit a low, growling whisper, clearly trying to indicate something to his shipmates. Obi-Wan says, "I can't hear a word he's saying." Luke adds, "Yeah, Han, can't you tell your friend to speak up a bit?" Han replies, "Sorry guys... that's just how the Wookiee mumbles."