Firefly

[In the present day, River is violently refusing to cooperate with Simon's diagnostic tests.]

Mal:
So, she's added cussing and hurling-about of things to her repertoire. She really is a prodigy.

Simon:
It's just a bad day.

Mal:
No, a "bad day" is when someone's yellin' spooks the cattle. Understand? You ever see cattle stampede when they got no place to run? It's kind of like a… a meat grinder. And it'll lose us half the herd.

Simon:
She hasn't gone anywhere near the cattle.

Mal:
No, but in case you hadn't noticed, her voice kinda carries. We're two miles above ground and they can probably hear her down there. Soon as we unload, she can holler until our ears bleed—although I would take it as a kindness if she didn't.

River:
The human body can be drained of blood in 8.6 seconds given adequate vacuuming systems.

Mal:
See, morbid and creepifying, I got no problem with, long as she does it quiet-like.