Cabaret?
Nada.
Last clue: It is a sequel…sort of.
Someone guess it please! I know I know this, but can’t think of it.
Hey. Are you the kind of kid who reads
the last page of a mystery first?Who pesters the magician
to tell you his tricks?Who sneaks downstairs to peek
at his Christmas presents?No. Of course you’re not!
♪ That’s why I’m not gonna tell you. ♪
A musical remake of Lost Horizon? 
There actually was one, but it is not the movie we’re looking for.
“Reading a book?”
[coupled with the campest double-take ever]
Marie Dressler to Jean Harlow in Dinner at Eight.
“Sorry we were gone so long, but we had to pick up [character]!”
Centauri (Robert Preston channeling his *Music Man * character) in The Last Starfighter
A: I want you to give this scumbag a cavity search. I’m talking Roto-Rooter. Don’t stop until you reach the back of his teeth.
B: (After the search) Did I just score?
Beavis and Butt-Head Do America.
Yes! 
It was the last line that jogged my memory.
“Your Honor, I don’t think I can dignify this—creature—with any more questions.”
Correct!
Here’s a great exchange that’s probably not well-known these days:
A: Who are you?
B: I represent the Law and Sanity.
A: I am the Law here!
B: I said Law , and Sanity.
BTW, this was “Lincoln”. James Spader plays F.N. Bilbo, a lobbyist/fixer who is working for Secretary of State Seward to convince/blackmail Senators into voting for the 13th amendment. He’s been told in no uncertain terms that he works for Seward, not Lincoln, and isn’t even to mention Lincoln’s name in his work. There’s a scene where Bilbo and his 2 aides are playing poker when Lincoln unexpectedly walks in, leading to Bilbo jumping up and exclaiming “Well I’ll be fucked!” and Lincoln replying “I wouldn’t bet against it.”
No idea - but it is a great exchange
Simply more cinematic philistinism, it’s the only explanation. Answer: Running Scared - IMDB Link
Ok, this one should be easier:
“What kind of an asshole grows up in Seattle and doesn’t even know how to swim?”
It is. It’s between Ralph Richardson and Raymond Massey in H.G. Wells’ Things to Come