The Joker debuted in Batman #1, the Spring 1940 launch of the Dark Knight’s dedicated comic-book series; it also revealed the superhero’s origin for the first time and contained the first appearance of Catwoman. (Batman first appeared in a separate series, Detective Comics, which gave DC Comics its name and in which he still stars to this day.)

But the creation of the Clown Prince is shrouded in controversy, with the three men involved — writer Bill Finger and artists Bob Kane and Jerry Robinson — each offering a different account of how the Joker came to be. The exact order of events varies depending on who you believe, but in essence, the character was a hybrid of influences. Robinson produced a joker playing-card design. Finger provided inspiration in the form of a clown-face logo from Coney Island and, crucially, a picture of actor Conrad Veidt playing the disfigured, permanently grinning title character in the 1928 horror film The Man Who Laughs. Both Robinson and Kane, who for decades received sole credit for the creation of Batman, designed the character on the page, while Robinson and Finger helped develop the concept of the Joker as Batman’s nemesis. The result was a villain unlike any of the gangsters and mad scientists Batman and his recently added sidekick Robin had ever faced before.

I compiled the history of the Joker for Rolling Stone. I love these assignments because, in a culture that treats corporations and brands as creators, they’re a chance to give credit where it’s really due. (Yes, even to Bob Kane.)

Better to be a king for a night than a schmuck for a lifetime!
—Rupert Pupkin, The King of Comedy

Laugh and the world laughs with you!
—The Joker, Arkham Asylum: A Serious House on Serious Earth

Stop me if you’ve heard this one before: Robert de Niro will soon co-star in a film about a deranged man who fancies himself a comedian and is driven to crime by a late-night talk show host.

This time around, however, de Niro isn’t playing the insane up-and-comer, as he did in Martin Scorsese’s 1982 black comedy classic, The King of Comedy. Rather, rumor has it, Bobby D will be the superstar who spurs Joaquin Phoenix’s descent into madness in director Todd Phillips’ stand-alone movie about the Joker, nemesis of Batman and anyone taking Jared Leto seriously alike.

That distinctive chemical odor you’re smelling isn’t Smilex gas, but an air of superfluousness surrounding the whole project. The movie exists in parallel to the DC film universe, where Leto remains attached to both a Suicide Squad sequel (where his take on the character debuted) and in his own stand-alone Joker movie. Nor is it simply that the work of Martin Scorsese is cited as an inspiration anytime Phillips’ movie pops up in the trades. To an extent, that stands to reason: Scorsese is the film’s executive producer, and his signature star is in the cast. “Grim and gritty,” Taxi Driver, ’70s/’80s noir — word on the street, including what Polygon has heard from crew members, is that the Joker movie is an extended Marty homage.

Here’s the thing: The King of Comedy already is a near-perfect Joker movie. (It’s a near-perfect movie in general, but it’s a Joker-specific one, too.) It’s a glimpse into the mind of a man who’s convinced, despite all evidence to the contrary, that he’s one of the funniest people in the world, and who’s determined that the world must be made in on the joke. Beneath the purple suit, green hair and greasepaint-white skin, that’s what makes the Joker tick.

I’d like to thank Joaquin Phoenix’s upcoming Joker movie for giving me the excuse to write at length about Martin Scorsese’s The King of Comedy for Polygon. Guest stars include Robert De Niro, Sandra Bernhard, Jerry Lewis, the Clash, Grant Morrison & Dave McKean, Alan Moore & Brian Bolland, Frank Miller, and a lengthy encomium to Jack Nicholson’s Joker in the first Tim Burton Batman movie. Rupert Pupkin, ladies and gentlemen!