Small Jane being Literal-Minded and showing her snarky tendencies. She was told she had a wicked heart and to pray to God to change it: to give her a new and clean one: to take away your heart of stone and give you a heart of flesh. "I was about to propound a question, touching the manner in which that operation of changing my heart was to be performed."
While the scene of Edward Rochester almost being burned to death by the Bertha In The Attic in Jane Eyre is rather serious, you can't help but chuckle at the dialogue:
Edward Rochester: (after being doused by water) Is there a flood?