Mid-stab, Batman instinctively breaks the Joker's neck just enough to paralyze him. Joker laughing his last laugh while he snaps his own neck. As a group of innocents, who believe that Batman murdered the Joker, scream and flee, Batman confronts his opponent.
Originally Answered: Can someone break their own neck as the Joker did in the animated film adaptation of Frank Miller's The Dark Knight? The Joker did not break his own neck; Batman broke his neck. The Joker just twisted it even further so that he died from it.
This narrative corroborates what happens in the comic. In The Dark Knight Returns #3 (by Frank Miller, Lynn Varley and John Constanza), Batman follows Joker into an amusement park to put an end to his killing spree. In the gut-spilling brawl, Batman, desperate to stop the Joker, snaps his neck enough to debilitate him.
Joker, wearing his own version of the Batsuit, used Batman's extensive (and expensive) gadgets against him in the climactic fight, but, as soon as he got the upper hand, the villain was surprised by a bullet to the eye from Harley Quinn.
In the documentary I Am Heath Ledger (via Digital Spy) it's revealed that, in order to keep the prosthetics in their place as they got loose when he spoke, Ledger had to lick his makeup to keep it in place, and it ended up becoming part of the Joker's manic personality, as well as his most memorable mannerism.
The Joker and Batman's relationship is one of the most fascinating and famous relationships in superhero comic books. The Clown Prince of Crime is the villain Batman fears the most, in no small part thanks to their many similarities.
It is then revealed that the Joker's real name is "Jack Oswald White." Martha then shares that she visited the Flashpoint universe's version of Jack Oswald White, discovering him to be a struggling family man supporting his wife and a child as a janitor at Wayne Casino.
The Joker has had various possible origin stories during his decades of appearances. The most common story involves his falling into a tank of chemical waste that bleaches his skin white and turns his hair green and lips bright red; the resulting disfigurement drives him insane.
Batman has fought numerous villains in his time as the Caped Crusader, but few have harmed him and his allies as much as the Joker has. Batman has admitted several times that his enemies don't get worse than the Joker, so it's obvious that the clown has left a deep scar in Batman.
Michael Keaton's Batman cowl didn't allow him to turn his head, so he cleverly worked this into his Batman performance, crafting a not-quite-human style of walking and turning.
If you ask Joker, it's a moot point—as he famously states in Detective Comics #664, a side effect of Joker's tumble into the Ace Chemicals vat is an immunity to all toxins, up to and including fear gas.
When Jerome seemingly died, his corpse went through a procedure which attempted to revive him. When the procedure seemed to fail, a cult decided to instead remove Jerome's face due to his criminal reputation.
Narratively, he got a permanent smile scarred into his face just by being born, which is tragic. But cinematically, the idea came from the 1928 silent movie that inspired the character's creation in the first place, The Man Who Laughs (the link to The Batman Who Laughs is clear).
Jared Leto portrayed supervillain Joker in the comic book-based movie and his version of the character had the word “damaged” tattooed across his forehead, an idea that Ayer proposed.
DC Universe. Harleen Quinzel was a psychologist at Arkham Asylum, and after meeting the Joker, she became his frequent accomplice, took on the name Harley Quinn, and got into an abusive codependent relationship with him.
Everything seems to be going swimmingly until Arthur lets himself into Sophie's apartment after his mother's death, and she barely recognizes him. Viewers then see alternate versions of Sophie's scenes where Arthur is interacting with thin air, clearly indicating that the entire relationship was a fabrication.
The psychopathology Arthur exhibits is unclear, preventing diagnosis of psychotic disorder or schizophrenia; the unusual combination of symptoms suggests a complex mix of features of certain personality traits, namely psychopathy and narcissism (he meets DSM-5 criteria for narcissistic personality disorder).
As such, his most terrifying form—seen in Scott Snyder, Greg Capullo, and Jonathan Glapion's “Death of the Family” arc—feels too visceral to ever become a live-action film. The Joker in “Death of the Family,” spanning Batman (2011) #13-17, brings a tailored sense of terror to Gotham City.
There's no doubt that recalling the fate of his parents is Bruce's biggest fear and regret. No matter who kills Batman's parents in different media, it's the catalyst to the person he becomes. Bruce spent all his childhood and early adulthood scared of remember what had happened.
He taunts his victims with pseudo stories of trauma in order to ramp up the tension before he inevitably gets his laugh by maiming or killing someone. The origin of his scars remains a mystery because the Joker doesn't care about how he got them anymore; he merely cares for the effect they have invoking fear in people.
A fan asked Ayer on Twitter about the strange plot hole that Joker's teeth are at the center of. Batman only knocked out Joker's teeth after the Clown Prince of Crime murdered Robin. He has the resulting grill while he's locked in Arkham Asylum, the place he'd first meet Harleen Quinzel.
Finally reaching his breaking point, Batman freed himself from his restraints and attacked the Joker before strangling him to the point of breaking his neck, killing his archenemy and ending his reign of terror once and for all.
