Time for some thrilling heroics.

Jayne

You got yourself a ship and you're a captain. Only I think you're still a sergeant. A man of honor in a den of thieves

Badger

You can't change that by getting all...bendy.

Jayne

What the hell's going on in the engine room? Were there monkeys? Some terrifying space monkeys get loose?

Mal

Oh my God, what could it be?! We're all doomed! Who's flying this thing?! Oh right, that would be me.

Wash

Kaylee: I guess that makes us one man short.
Jayne: Little Kaylee's always one man short.

Inara: What did I saw about barging in to my shuttle?
Mal: That it was manly and impulsive?
Inara: Yes, precisely, only the exact phrase I used was, "Don't."

I don't believe there's a power in the 'verse can stop Kaylee from being cheerfu

Mal

Simon: What happens if they board us?
Zoe: If they take our ship, they'll rape us to death, eat our flesh and sew our skins into their clothing. And if we're very, very luck, they'll do it in that order.

Zoe: Jayne?
Jayne: Hell, I didn't fight in no war. Best o' luck, though.

How we treat our dead is part of what makes us different from those who did the slaughter.

Book

I'm thinking you weren't burdened with an over-abundance of schooling.

Mal

Firefly Quotes

Mal: You're only going to scare him.
Jayne: Pain is scary.

Mal: I gotta know how close the Alliance is, exactly how much you told them before Wash scrambled your call. So I've given Jayne here the job of finding out.
Jayne: He was non-specific as to how.