The first fight in Candieland. Dr. Schultz goes for Honor Before Reason, but takes out Candie in a great way, even dropping a one-liner before getting blown away. Django takes out The Dragon, and proceeds to demolish the Candieland gunfighters, being forced to give up only when Brunhilde is threatened.
Django's final attack on Candy Land is nothing short of awesome.
Django: Seventy-six years Stephen, how many niggers you think you see come and go, huh? Seven thousand? Eight thousand? Nine thousand? Nine thousand, nine hundred and ninety-nine? Every single word that came outta Calvin Candie's mouth was nothin' but horseshit. But he was right about one thing — I am that one nigger in ten thousand!
Made better by the fact that (a) Django is dressed in Calvin's classy burgundy suit he wore the first time they met and (b) he lights the TNT with Candie's cigarette holder, and even holds on to it after blowing the mansion to smithereens. Now THAT is a truly awesome moment.
The explosion itself, with Django stood calmly in front of it, shades, cigarette holder and all, then turns back and grins, is the very definition of a CMOA.
Another subtle accomplishment is Django going from reading "five thousand" as "five-zero-zero-zero" to properly (and badassedly) using the relatively complicated number "nine-thousand nine-hundred and ninety-nine" in the span of one winter.
What makes this more awesome is that in the previous scene, Candie had delivered a hateful "The Reason You Suck" Speech to Django and all blacks. The basis of Candie's argument was phrenology and his "discovery" that all black people had three dimples located in the back of their skulls which "proved" blacks' brains were hardwired towards being naturally subservient. Candie also stated that the dimples in the back of whites' skulls "proved" whites to be naturally smarter and more creative. Schultz blew Candie's nonsense arguement entirely away with the simple reveal that a black man wrote one of the most popular and beloved books of all time.
The scene has a small Genius Bonus if you know phrenology has long been been discredited as pseudoscience. It's possible for the audience to take in a sense of pleasure at hearing Candie blather on with his ignorant bullshit while knowing how utterly wrong he is, especially considering that by 1858 phrenology had already been widely dismissed in the U.S.
A possible meta Genius Bonus, as well: racists have long used thoroughly discredited science as "proof" of their beliefs. Schultz and Moguy in particular would likely have the appropriate educations to know this.
Also well-known as a notorious instance of Enforced Method Acting. When Candie slams his hand upon the table, he smashes a crystal glass with it and severely cuts himself, continuing to rant in his rage and getting his blood on Broomhilda's face. This was an accident on Leonardo DiCaprio's part, but he continued with the scene despite everyone around him slowly realizing his hand was gushing blood.
The trap laid for Bennett's gang, consisting of filling the dentist's wagon with dynamite and then shooting it when they arrive.
After Django kills the slavers and blows up Tarantino, he walks out of the cloud of smoke in slow motion, like a Badass, while John Legend's Crowning Music of Awesome blares. Oh yes.
The newly freed slaves that Django came with all taking their vengeance upon the last Speck brother.
Django stopping Big John Brittle from hurting a slave, and then subsequently shooting him, and then taking Big John's whip to Little Raj, the same Brittle brother who whipped Broomhilda several times, and finally shooting him with his own gun.
The first of these is capped off with Django's fantastic Post-Mortem One-Liner to Big John. "I likethe way you die, boy." With one bullet and one well-placed quip, Django establishes how far he's come from the shivering, helpless slave he was introduced as.
There's also the moment after that where Ellis gets sniped across a field with a musket. His chest explodes, spraying the cotton flowers with red. A very effective bit of cinematography.
Django shooting down Big Daddy in a single shot with a rifle he had never used before while Big Daddy was riding a horse several hundred meters away in the dark. Schultz then realizes that Django has Improbable Aiming Skills.