That's really beautiful. There's an aching quality to the words that's almost haunting, but it's quietly brilliant and true to both characters at the same time.

Sam smiles. "Then I'll say goodnight, sir." He grips the knob, and then as though plunging into water, he blurts out, "Thank you, sir, for all you've done for us. For Rosie and me."

Frodo is puzzled, and then replies "No, Sam," and shakes his head. "It is only my thanks to you. Were it ten times more, it would not be enough. You know not what a comfort it is to me to see you so."

Really like that exchange, specifically.