Whenever, during a conversation, someone is telling me that their job is wrecking them but they have to work, I always say, “Dyin’ ain’t much of a livin’.” (“The Outlaw Josey Wales”)
“Shut the fuck up, Donny!”, although I’m not thinking about a movie when I say it. Usually just watching the news.
“Just this ashtray” from The Jerk whenever I’m grabbing stuff to carry.
Son, you’re on your own…
For my next impression, Jesse Owens!
Picked the wrong week to quit sniffing glue!
I posted “Looks like I picked the wrong week to stop sniffing glue” on Facebook the day after Trump got elected. It wasn’t inadvertent though, definitely intentional.
Kind of a deep cut line, too. Clue is in my language more or less permanently. The only inadvertent line is “Too late”, but I quote it all the time.
I have to fight the urge sometimes to say, “Yeah…hi…I’m gonna have to ask you to…”
From Lumberg in Office Space. I’m a teacher and sometimes, I want to use Lumberg’s style as my own little sarcastic tone. “Yeah…hi…I’m gonna have to go ahead and ask you to…not hit your neighbor. OK? All right. Uh huh.”
Man, Office Space really nailed the way some managers speak.
I just learned something…
Apparently Mystery Science Theater 3000 used “Push the button, Frank” which came from “Push the button, Max” from The Great Race (what I just learned).
I always use “Push the Button, Frank” from MST3K.
Being hard of hearing, and often in noisy bars, I’ll miss part of a story and have to ask "Wait, who shot who in the what?"
(Lisa Simpson)
I like some of the lines from ‘Other People’s Money’ because they sound like the an evil ex-president/crappy businessman. I wouldn’t ever say the lines out loud but I hear them in my head when I watch him on TV.
If I’m in a friendly group, having a friendly discussion and someone says, “That’s not true!” I fire back, “It IS true you… pompous ass!” — Gene Hackman, Poseidon Adventure
Same group, someone is in awe about how large something is and says, “Look at the size of that thing,” Immediately: “Cut the chatter, Red 2!”
Hehehe, I use that one, too.
Also, when someone says something emphatically:
Oh Lisa, you and your stories. Bart’s a vampire, beer kills brain cells. Now lets go back to that…building…thingy where our beds and TV…is.
When someone says something complex and hard to understand, and has big words, or is just unintelligible, I say “The what-y-what-n?” - Ace Ventura, Pet Detective.
Is that Jasper, not Lisa?
Not movie but book lines.
I used to say whenever I saw something weird " It isn’t natural , and trouble will come of it!", for years I didn’t really know the origin of the quote until a few years ago I realized it’s from… The Lord of the Rings 
(Said by some Hobbits about Bilbo seemingly not getting old)
On a job interview, I was asked for three words that described my professional philosophy, but I started to explain one of them in detail and got a look from the interviewer – whereupon I said, “You caught me monologuing!”
They got the joke, and I got the job.
Also from Pixar: “This is the perfect time to panic!”
When someone’s operating a noisy appliance or piece of machinery, I’ve been known to ask “ARE YOU SURE IT’S ON? I CAN’T HEAR A THING!”
Bits of comedy routines have embedded themselves in my vernacular. If I’m talking about somebody who made some great accidental discovery, I might toss in “…and that kid should be put to work on the space program.” (from Denis Leary’s No Cure For Cancer). And If I’m experiencing a stressful time at work, I’ll say “Just look into my eyes, you’ll see bats and screaming children.” which is a Dana Gould line.
Further to the Goodfellas quotes above, a friend and I always used to, if one asked the other for a favor, reply with “I can’t, I gotta meet Tuddy.” and then we’d wind up doing the rest of Pesci’s rant.
You could probably reconstruct a season of “The Simpsons” (but in the original latino spanish) just from hearing my family talk for a week.
Also (from Sports Night): “Do you need a mnemonic device?”
We do this one a lot, but we usually add “Shelly.”