Simon: What are you doing?
Mal: I’m fixing to do some business. Can’t be herding these steers and your sister, too.
Simon: She didn’t mean any harm.
Mal: I never figured she did. But when a man engages in clandestine dealings, he has his preference for things being smooth. She makes things not be smooth.
Simon: Right. I’m very sorry if she tipped off anyone about your cunningly concealed herd of cows.
Firefly — Episode 5 — “Safe”