The Red Lectroid John Bigbootie actually gets shot because of his insistence that his surname be pronounced "big-boo-TAY".
In Alexander, when Nearchus subtly jabs that Parmenion's flank nearly crumbling at Gaugamela cost them the chance to catch Darius, Parmenion's son Philotas rages at him, starting with "How dare you, Nearchus!" prompting Nearchus to talk over him, "General Nearchus to you!"
From Clerks in the View Askewniverse (Clerks II to be specific): when Randall arranges for a donkey show for what's supposed to be Dante's going away present, he refers to it as "bestiality". The guy running Kinky Kelly's performance is always quick to correct him: "It's interspecies erotica, fuck-o!"
Preston: Then I have no choice but to remand you to the Palace of Justice for processing. Mary: Processing. You mean execution, don't you? Preston: Processing.
In both Escape from New York and its sequel, Escape from L.A., the U.S. government is on a Last Name Basis with protagonist Snake Plissken, to which he consistently replies, "Call me Snake". However, during the respective climaxes of both movies, when one of the government's men finally does call him Snake, he reverses his previous attitude with the reply "The name's Plissken".
Fanboys: "You live in your mom's garage!" "It's a CARRIAGE HOUSE!"
Danny: When did you first know you wanted to be a policeman? Angel: Officer. Danny: When did you first know you wanted to be a policeman officer?
"It's the police service; 'force' is too aggressive."
"She's a police officer; being a man or woman has nothing to do with it."note Yes, it does, I've seen her bra!
"Traffic collision; 'accident' implies there's no one to blame." (Obviously, that one's not so much meant for comedy. Later becomes a Plot Point AND Foreshadowing).
This is also shown at the end of the movie to show the Character Development of both main characters. Danny is the one to make the vocab guideline correction, showing that he's starting to take the not-so-action-packed moments of being a police officer a little more seriously, as he actually knows some of the guidelines. Angel is then the one who responds with a Double Entendre, showing that he's not taking himself quite so seriously anymore, and isn't as obsessed with being a model police officer every single moment of every day.
It's not a rubber plant, it's a Japanese peace lily!
(Grinch is searching for a party outfit; he grabs a tablecloth and wraps it around his waist) Max: [barks at him] Grinch: It's not a dress, it's a kilt! (rips off tablecloth)SICKO!
Hunter Prey: The alien bounty hunter prefers to call himself a soldier of fortune.
During Iron Man 1, Tony Stark is the lone civilian riding in a Humvee in Afghanistan. He asks the driver whether it's appropriate to call her a "Soldier" or if there is a prefered nomenclature since she's female. She points out that the correct nomenclature is Airman, because she is in the US Air Force.
In Iron Man 2 Tony insists during the Senate Subcommitee hearing that The Iron Man armor is not a weapon but is instead a high-tech prosthesis.
In the third Men In Black movie, the villain corrects anyone who calls him "Boris the Animal", insisting that his name is just Boris. The protagonists respond by referring to him exclusively as "Boris the Animal".
Kah Mun Rah: Are there any questions? Al Capone: Yeah, I got one. How come you're wearing a dress? Kah Mun Rah: This is not a dress. This is a tunic.
In the German comedyPappa ante Portas, the title protagonist insists that the dish "Birne Helene" (Poire Belle Hélène) has to be pear with chocolate sauce — not pear with vanilla sauce, or apple with chocolate sauce. He is technically correct, but his insistence (among other things) leads to repeated rows with his wife. When at the end of the movie a waiter mentions that in this restaurant, Poire Belle Hélène is apple sauce with whipped cream, and "Pappa" doesn't mind, you can see they're happy again.
Inspector Clouseau of the Pink Panther films. Once promoted to his boss' old job, he finds himself constantly having to correct people of his full title. "Ah, Inspector Clouseau!" "Chief Inspector."
Jones: You've been captain of the Black Pearl for thirteen years. That was our agreement. Sparrow: Technically I was only captain for two years before I was viciously mutinied upon. Jones: Then you were a poor captain, but a captain nonetheless. Or have you not introduced yourself all these years as "Captain Jack Sparrow"?
Also, in the first movie:
Will: We're going to steal that ship? Jack Sparrow:Commandeer. We're going to commandeer that ship; nautical term.
And in the 4th movie:
"You are Jack Sparrow?"
beat "There should be a Captain in there somewhere."
When another pirate mentions Jack Sparrow (sans "Captain") in front of Will and Elizabeth, they both spontaneously blurt out "Captain".
Joe Gillis: I was only asking; I didn't know you were planning a comeback. Norma Desmond: I hate that word! It's a return, a return to the millions of people who've never forgiven me for deserting the screen! Joe: Fair enough.
In Terminator 3: Rise of the Machines John refers to the T-850 as a robot. It quickly corrects him with about as much annoyance as possible for an emotionless killer robot.
John: No I can do whatever I want, I'm not a robot like you!
T-850: Cybernetic organism.
In Transformers, Simmons insists on calling Megatron "N.B.E.-1", even after finding out his name. This even carries into the second film, after Megatron is brought Back from the Dead. "N.B.E.-1 still ticking eh?"
Undercover Blues: A minor villain insists that his name is "Muerte". He is very insistent on this point, especially since the protagonists insist on antagonizing him by calling him "Morty". Near the end of the show, the protagonists end up pretending that Muerte is the Big Bad and their boss, which leads poor Muerte to try desperately to claim that his name is really Morty.
In Unforgiven, Sheriff Little Bill Daggett insists on calling English Bob the Duck, not Duke of death. When he's called out on it one time too many he gives a brief Death Glare: