Shakespeare quote (from memory, so forgive if it wanders)

[seymoure]

"Do you bite your thumb, sir"
"Aye sir, I do bite my thumb."
"Do you bite your thumb at me, sir?"
(aside) "Is the law of our side if I say aye?"
"No."
"No, sir, I do not bite my thumb at you sir. But I do bite my thumb sir!"
R&J, act 1, scene 1