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."
				--Episode #14, "Objects in Space"