That was intense... it's funny because that moment was foreshadowed at the end of the first two-parter, Serenity...
(possible innaccurate quoting)
Mal: But he did make you an offer...
Jayne: (pause) Yeah.
Mal: Why didn't you take it?
Jayne: Money wasn't good enough
Mal: What happens when it is?
Jayne: Well, that will be a very interesting day.
Mal: [insert pensive agreement here]
Then in the last ep, Objects in Space, when Jayne was talking about River like he didn't want her on the ship, Mal was in his face in a split second "Is that the direction you want this conversation to go in?" It was great.
I think one of my favorite moments of the show is when Badger is holding the crew more or less hostage on their own ship and River comes out from the back and, with an accent, breaks down Badger's whole life. It was epic. Summer is great.
Another note, I watched the movie again, and looked at the special features... has anyone seen Joss Whedon's introduction to the movie... where he basically attributes the movie to the Browncoats (Fans). I've never seen a creator honor the fans so highly... not even when Mark Hamill made that Comic Book: The Movie thing.