In
Serenity (the movie), there's a point when the crew first arrives on Miranda, when Jayne states (speaking of River) "She's going to damage my calm."
Twice in episodes of last year's
Chuck, Adam Baldwin (as John Casey) made comments about "his calm".
In yesterday's episode of
Castle, Richard Castle (Nathan Fillion) shoots the gun out of the bad guy's hand when the bad guy was about to shoot Castle's "partner" Kate Beckett. Beckett says, "nice shot", and Castle replies, "I was aiming for his head."
Jayne spoke the exact same line in
The Train Job, when he shot the knife out of Crow's hand as he was about to kill Mal with it, after Mal said "nice shot."
It's fun being in on the inside jokes.