Blazing Saddles?
I thought this one would go down immediately. To help you out, here is the rest of the line:
“The one who wouldn’t give us the rifles!”
“How am I not myself?”
N0-This movie is a musical.
The King and I?
No, I am not looking for the names of random musicals.
It was an educated guess based on “Getting to Know You.” I could imagine Deborah Kerr singing it.
The answer is “Shock Treatment”, the sequel to “Rocky Horror Picture Show”.
Never in a million years would I have gotten that. 
Funny thing is, I did know it. I could have sworn I answered it upthread. I must not have hit reply?
I’m pretty sure I got Arthur right up there, so I’m going to float another one:
“Awkward turtles make weird babies.”
“Happy New Year to you,…in jail!”
“Hello. Is anybody there? Anybody at all?”
It’s a Wonderful Life.
Yes. That’s it.
Lionel Barrymore was great as Mr. Potter.
Just a guess, The World, the Flesh and the Devil?
That’s not the movie I’m thinking of, but a few movies have similar lines.
The Day After
“What’s up, y’all? I’m the last man on Earth. Shit’s all f***ed up. Don’t forget to like and subscribe. We out here.”
“Did you have a pleasant evening last night?”
“Yes, thank you.”
“Did you do any fornicating?”
Frost/Nixon.