The non-sequitur Python quote thread was fun to read, but you have to admit, that it’s not too hard to find a non-sequitur when it’s Monty Python you’re talking about - but how about finding a quote (from a different sketch naturally) that responds to the one in the post before?
Can it be done?
I’ll start with: “It’s not much of a cheese shop, is it?”
“Yes it is!”
Obligatory:
“No, it isn’t!”
I’m sorry, but I’m not allowed to argue unless you’ve paid!
I don’t think there’s a punch-line scheduled, is there?
“This is supposed to be a happy occasion.
Let’s not bicker and argue about who killed who.”
'ee’s not dead – ee’s resting.
He’s a very naughty boy.
And the Lord spake, saying, "First shalt thou take out the Holy Pin. Then shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out. Once the number three, being the third number, be reached, then lobbest thou thy Holy Hand Grenade of Antioch towards thy foe, who, being naughty in my sight, shall snuff it.
I didn’t expect a kind of Spanish Inquisition.
Ahem…the obvious
“Noooooobody expects the Spanish Inquisition!”
The OP explicitly states the responses are supposed to come from other sketches, not the same sketch as what you’re responding to.
“Now hand over all your lupins!”
“Inconceivable!”
(Am I doing this right?)
Come at me with that banana then. Come on attack me with it. As hard as you like. Come on.
We mustn’t fight each other! Surely we should be united against the common enemy!
The Judean People’s Front?!
No, no! The Romans!
“Rule Number 2: No Poofters.” 
And now for something completely different…
“Is your wife a… goer? Eh?”
I’m Brian, and so is my wife.
I want to be a woman. From now on, I want you all to call me ‘Loretta’.