You leave my name
Just that way!
He said, Mrs.,
(With a snort)
Just a K
Makes your name too short.
I said, I don't
Give a damn!
Leave me and my name
Just like I am!
Furthermore, rub out
That MRS., too--
I'll have you know
I'm Madam to you!
The census man is so bent on changing her last name, so she finally gives him something else he can change…  Madam  demands more respect than the more commonly used prefix  Mrs. 

Madam and the Census Man