Conceptual continuity

The following are lyrics from the conclusion of a Frank Zappa song about the medical condition bromidrosis (Stink-Foot) involving Fido the talking dog:

...And you know what he said?

"Once upon a time, somebody say to me..."
[This is the dog talkin' now]
"...'What is your conceptual continuity?'
Well I told 'em right then," Fido said,
"It should be easy to see,
The crux of the biscuit
is the apostrophe."

Well you know, the man that was talking to the dog
looked at the dog, and he said,
sort of staring in disbelief,

"You can't say that!"

First, the narratorial insertion reminding the listener who is speaking: hilarious. Second, the man's reaction seems to be more averse to what the dog says than to the fact it speaks at all. They proceed to argue; No-No-No, Yes-Yes-Yes. Ain't this boogie a mess?