"Why would I want to do that?"
Mrs. Sippican
I'd say it's a handy expression, or query, or response, for the verbal toolbox, but it does not work as a response to many pleasant things (eg, "Mrs. Sippican, would you like some Strawberry Shortcake?" or "Mrs. Sippican, would you, the Mr., and the boys like to take a ride to Nice on my new G6 for a week at my villa in Cap d'Antibe?").