Monday's Idiom (Or question?)

A ubiquitous "word" that my mother has always deplored is "Duh."
The expression is found commonly among the youth, working as a response to an obvious question. It is pronounced several different ways: all unattractive and all designed to compel a sense of inferiority in the recipient.
Example:

Person A: "So December 25th is Christmas, Right?"
Person B: "Du-uh" (stressed to two syllables to call attention to how stupid [pardon the adjective] the question is.)

A by far less humiliating response, as coined by my only uncle, is
"Does ten pounds of flour make a big biscuit?"

Not only does it endear you to the questioner far more than the depressing "duh" it is almost guaranteed to produce a smile.