Mal: But she does have an oddness to her. And I ain't just talking about her proficiency with firearms. Girl knows things. Things she shouldn't. Things she couldn't.
Jayne: Wha-...are you-are you sayin' she's a witch?
Wash: (sarcastically) Yes, Jayne. She's a witch. She has had congress with the beast.
Jayne: She's in Congress?
Wash: (amazed) How did your brain even learn human speech? I'm just so curious.