
"It’s this kind of terrible re-introduction to the Joker where he kills off all his henchmen. And of course, that’s how the Joker film ('The Dark Knight') was. Right at the beginning he kills off all his henchmen. I talked to the writer of the film and he said, 'Neal, a lot of people are going to tell you that we borrowed from ‘The Killing Joke.’ Bullshit. We borrowed from this.' This is the matrix of that film." --
Neal Adams
In honor of Neal Adams who passed away, here is one of his most iconic comics (and covers). It's also significant in that Adams along with Denny O'Neill had brought back the Joker after a lengthy absence and revitalized the character as Batman's archnemesis.
(On a related note it was also Neal Adams, per the book 'The Batman Files', who decided that
the Joker was gay. While DC has yet to make this official canon it's still an element of the character that has long since persisted with different writers.)
( Scans under the cut... )