The idea that no gentleman ever swears is all wrong. He can swear and still be a gentleman if he does it in a nice and benevolent and affectionate way.
Mr. and Mrs. Boffin sat staring at mid-air, and Mrs. Wilfer sat silently giving them to understand that every breath she drew required to be drawn with a self-denial rarely paralleled in history.
So that's why one of my rules of parody writing is that it's gotta be funny regardless of whether you know the source material. It has to work on its own merit.