“Do you know how much water it takes the Germans to make a ton of steel?”
It’s from the 1985 movie, “Re-animator”, from the operating room scene near the end of the movie.
“Alright, stand back you pedestrians, this ain’t no automobile accident.”
Back to the Future, possibly II but most likely I, said by Biff Tannen to Marty McFly.
Dr. Strangelove, or how I’m not going to write the whole title. 
Back to the Future III, said by a random bar patron after Marty landed a full spittoon on Mad Dog (don’t call me Mad Dog) Tannen. Just saw that clip the other day!
I think it’s Slim Pickens in Blazing Saddles. Right actor, wrong movie.
“Well, boys, I reckon this is it. Nuclear combat toe-to-toe with the Rooskies!”
Yep, that’s it.
Maj. Kong in Dr. Strangelove, obviously, but I believe he said “nucular”.
I’m not sure there’s any line in that movie that counts as “non-famous”. It might be more quotable than The Princess Bride.
Entirely possible; Eisenhower always did the same thing. (So did Dr McCoy, IIRC.)
“The first thing you’ve got to learn about this ship is that she was designed by geniuses to be run by idiots!”
Shakespeare in Love?
“Young minds; fresh ideas. Be tolerant.”
Yes! Well done!
Here’s the full exchange, which is one of my favorite observations about show business:
Philip Henslowe: Mr. Fennyman, allow me to explain about the theatre business. The natural condition is one of insurmountable obstacles on the road to imminent disaster.
Hugh Fennyman: So what do we do?
Philip Henslowe: Nothing. Strangely enough, it all turns out well.
Hugh Fennyman: How?
Philip Henslowe: I don’t know. It’s a mystery.
Being as I’m working right now on a show that my wife is directing for her middle school, which has been disrupted by Covid and a million other insurmountable obstacles, the quote is extremely meaningful, and we’re desperately hoping that it will all turn out well.
No, it isn’t. It’s from the 1986, “From Beyond.” It’s even the tag-line on the movie poster.
Star Trek III: The Search For Spock
Yep.
“You said ‘hard work’ twice!”
“That’s because it takes twice as much hard work as perseverance.”
Character 1 Dude, it’s a history report, not a babe report.
Character 2 Yeah, but these are historical babes
Uhhh … Bill and Ted’s Excellent Adventure?