From Shakespeare’s “Twelfth Night,” act 2:
MALVOLIO. By my life, this is my lady’s hand. These be her very C’s, her U’s, and her T’s; and thus she makes her great P’s. It is, in contempt of question, her hand.
SIR ANDREW: Her C’s, her U’s, and her T’s? Why that?
A biscuit for the groundlings... especially when you recall that in Elizabethan English, the word “and” was typically pronounced “nnnnn.”