This is a conversation between a husband (J*******) and a wife (A*******) about why his writing partner (P*******), who is not in any sexual relationship with J*******, has decided to quit working with him:
J*******, I found out why P******* left you.
A*******, will you be quiet, we’re rehearsing.
J*******, I’m divorcing you.
The answer to No. 3 is There Was a Crooked Man. The trickster in question is actually an ex-con (English) who falls in with a bad lot after trying to go straight and ends up masquerading as a NATO officer (American). It was on Silver Screen yesterday afternoon.
Not to be confused with the Henry Fonda/Kirk Douglas western of the same name (1970).
This is from Ghostbusters: Answer the Call, the one with four female Ghostbusters. A sequel hook at the very end, but the sequel didn’t happen.
There you go … the best sequel/reboot of the bunch, in my opinion.
Okay, I’m back to do battle again.
A frustrated and angry arch villain has come to eliminate his chief enemy but has found it is a far more difficult task than he imagined.
Villain: “I need more men!”
Chief Henchman: “How many, boss?”
Villain: “EV - EEEEERY ONE!!!” 
Anyone want to think about this one again?
Sounds like Leon: The Professional.
Give this man a cigar!! 
Is there a better villain than Gary Oldman?
“Give me a squadron of Spitfires.”
The Longest Day, when Goering asks the fighter pilots what they want.
Right context, wrong movie. At least, not the one I’m thinking of.
Maybe The Battle of Britain?
A few, here is one contender.
“Love is a dung hill, Betty, and I am but a cock that climbs upon it to crow.”
The OP stipulated, “non-famous”, not “obscure”. LOL
This must be from an old movie because “Betty” has been extinct as a name for a long time.
I think the actual quote went something like this:
SWAT Team Leader: Alpha team, man down, man down.
Norman Stansfield: I told you. Benny, bring me everyone.
Benny: What do you mean “everyone”?
Norman Stansfield: EVERYONE!
Nonetheless, I got it from your quote anyway. He is one of my very favorite villains. The scene in Tony’s shop is chilling.
I have a lot of respect for your business, Tony. When you’ve killed for us in the past we’ve always been satisfied. And that’s exactly why today is going to be very, very hard for me. I hope you’ll excuse my mood.
And
I haven’t got time for this Mickey Mouse bullshit.
Here’s a new one:
“I couldn’t do that. Could you do that? Why can they do it? Who are those guys?”
Seen that movie many times - I think it’s Butch Cassidy and the Sundance KId?
You got it.
“Look at you, you’re in shambles.”
“I can fix it later. All I need is a needle and thread. …Did I just say that?”
That’s it! The incident with Goering actually happened. IIRC, it was top ace Adolf Galland who made the request.