"Don't waste it... Don't waste your life... St...ark..." Ho Yinsen, dying from the gunshot wounds he got to buy Tony Stark time to boot up the first Iron Man suit.
"I will give you these designs, as a gift, and in return, you will gift me with an army of metal soldiers." Raza, before being disposed of by Stane
"Hold still, you little prick!" Obadiah Stane, who is then killed by Stark Industries' arc reactor
"Now it's time for both of us to go." Stane's last words in a deleted scene, where he survived the initial arc reactor malfunction, but falls through the damaged roof onto the arc reactor, killing him.
"For making it clear how obviously mad you are." Nazi Major General Schneider, responding to Schmidt saying "For what?" after saying, "Thank you, Schmidt." Vaporized shortly after by a Tesseract-powered turret after the guy below.
"You will be punished for your insolence. You will be brought before the fūhrer himself!" Nazi Major Hutter, right before being vaporized by a Tesseract-powered turret
"SCHMIDT!!!" Nazi Colonel General Roeder, right before being vaporized by a Tesseract-powered turret
"I'm sorry, Herr Schmidt. We fought to the last man." A German officer, before being killed by Red Skull for failing him, who noted the inaccuracy of the officer's claim with a reply of "Evidently not."
"What have you done? No...!" Johan Schmidt (aka The Red Skull), right before being apparently vaporized by the Tesseract
"We'll have the band play something slow. I'd hate to step on your—" Steve Rogers, right before being frozen for seventy years
"It's okay, boss. This was never going to work if they hadn't have something to..." Agent Phil Coulson. He gets better.
Iron Man 3
"Savin, help! Help me!" Jack Taggert, as he explodes from Extremis
"Deputy, get this woman—" Tennessee Sheriff, before being killed by Ellen Brandt, one of Killian's mooks
"That all you got? A cheap trick and a cheesy one-liner?" Ellen Brandt, while trying to kill Tony Stark
"What about you? What happens if you get too hot?" Maya Hansen, before being killed by Aldrich Killian
"How did we get this shift?" Mansion Mook #1, killed seconds later by a laser blast from one of the hand pieces of the Mark 42
(Referring to President Ellis) "He's not here. Try the jet stream? Speaking of which, go fish." Eric Savin, as he blows a hole in Air Force One, sending passengers flying out, killed by Iron Man's unibeam shortly after.
"No more false faces. You said you wanted the Mandarin. You're looking right at him. It was always me, Tony. Right from the start. I AM THE MANDARIN!" Aldrich Killian, the self-proclaimed Mandarin (he's just using the name), before being defeated by Pepper Potts (who was injected with Extremis earlier)
Thor: The Dark World
"I will never tell you." Frigga, answering Malekith's question on where the Aether is, right before being killed by Kurse for not cooperating with Malekith
(In the Dark Elf Language) "He is an enemy of Asgard. I saw him as their prisoner." Dark Elf Algrim (aka Kurse). Killed by one of his blackhole grenades on his belt after stabbing Loki.
"Do you think that this can be stopped? The Aether can not be destroyed." Malekith, before his crushing defeat.
Captain America: The Winter Soldier
"Admit it, Captain, we are, both of us, men out of time!" Arnim Zola, before a missile destroys the facility along with the computers with Zola's conscience.
"You're mortal! How?!" Ronan the Accuser, before he is obliterated by the power of the Infinity Stone via Peter Quill and his buds, to which Quill replies, "You said it yourself, bitch. We're The Guardians of the Galaxy.".
Agents of S.H.I.E.L.D.
"Oh, God." The Englishman, before he is prosthetic eye kills him.