Lex Luthor: “C’mon, let me hear you say it.”
Lois Lane: “…you’re insane.”
Lex Luthor: [chuckling amiably] “No, not that. The other thing.”
Lois Lane: “Superman will nev-”
Lex Luthor: “WROOOOOOOOONG!”
I want to have your babies.
YOU WERE NOT BROUGHT UPON THIS WORLD TO, “GET IT”!
Holy shit, no wonder I’ve been down lately. It must be at least a year since I’ve seen that.
I don’t think people quote movies so much as they do TV shows now, at least depending what circles you’re in.
As an example, recently at work someone asked me to take a look at a design they had drawn up for something, so I looked over it, looked at them and said “That doesn’t look like anything to me”. My colleague a couple of desks away almost sprayed coffee over their computer; the person asking for my input gave me a confused look.
Similarly, it’s almost de rigeuer among some groups to employ “Phrasing!” when someone accidentally makes a double entendre, while Rick & Morty quotes have proven surprisingly useful for establishing my bonafides as someone who “Gets It” in a number of situations too.
Nice!
Show me what you got
When I was an Art Director for a small studio, the times I would bring in new projects to assign to everyone I’d usually begin by saying “Good News Everyone!” (in my best Farnsworth voice)
Most everyone got it.
Gets schwifty
At that point I don’t think Nux believes in Valhalla. That’s what makes the scene so poignant; he’s not dying to go to a better place. He’s dying so someone else can.
It’s an interesting coincidence. If you look at the movies that people have been quoting for a decade or more, you’ll find that all of them were released in 2007 or earlier.
Either way, the whole 'Witness me" bit is pretty critical to the story; first, as we see Nux’s War Boy buddy get mortally wounded, do his spray-paint, holler “WITNESS ME!” and then kamikaze that attacking car, and at the end, as Nux says it during his final heroic act.
We had Chinese food from Hong Kong Express in Trophy Club last night. The plastic take-home containers have large Chinese characters (presumably those for “Relax” and “Enjoy”, the English words transcribed beneath them) embossed on the lids.
My wife suggested they instead read “Hell of Boiling Oil”. 
Deadpool had some good quotable lines:
“Oh, I so pity the dude who pressures her into prom sex.”
“You look like an avocado had sex with an older, more disgusting avocado.”
“Your right leg is Thanksgiving and your left leg is Christmas. Can I come and visit you between the holidays?”
I do think my wife and I are starting to quote TV even more now. Arrested Development is our big one.
“I have no problem with that.”
“Her?”
“I don’t want to see that or think of it again.”
Just kidding. It says, “Keep out.”
“IT WILL NOT COME OUT AGAIN!”
“WHAT!? HUH!? WHAT WILL NOT COME OUT AGAIN!?”
“You know what old Jack Burton says. . .”
Little-known fact. Apparently, the actor that played Egg Shen was possibly killed by the 9/11 hijacking, in a roundabout way. He wasn’t well, having had a few strokes awhile back, but he stayed up all day and night, watching the news and aftermath. At first, he was worried about his sons in New York (they were OK, and he learned this), but he kept watching all night. He died on 9/12.
"Illusions, Michael. Illusions. 
The Bill Simmons “Sports Movie Hall of Fame” podcast, right? 
Same podcast that lead to this question (and to me watching Jerry MaGuire).
There are quotes that are famous here (on the SDMB, I mean), but few of these are going to be familiar with people not familiar with the movie. My grandmother, having never seen it, could quote Star Wars via cultural osmosis (“the force be with you”, which I just dropped dead one day when she laid that one on me.). If she were still alive today, she would have never gotten “I am groot!” or “This is SPARTA!” as those quotes never penetrated the zeitgeist to the point where even non-fans recognize them.
My daughters have used “This… Is… SPARTA!” despite never having seen the movie, and the fact they’d probably find it uninteresting. It’s slipped into the zeitgeist for sure.
“I am Groot,” not so much.
“I’ve made a huge little mistake.”
“I don’t understand the question, and I won’t respond to it.”