YMMV / Joker's Last Laugh

• Franchise Original Sin: This is one of the first times that the Joker has "gone all out" and caused Crisis Crossover levels of mayhem, single-handedly putting everybody in the superhero community against the wall (and trying to do a supremely elaborate and cruel attempt at a Suicide by Cop at the hands of Batman). This one, however, at least has the benefit of the fact that Joker (and everybody else, probably audience included) believes he is doing The Last Dance. By the time the Batman arcs Death of the Family, Endgame and Joker War along, however, audiences were starting to grind their teeth because "Joker decides to up his game, makes everybody in the DC Universe tremble, even the Physical God-types" was not only pile-driven into the ground, but the newest arcs had him as a full-blown Invincible Villain that even (sort-of) won in the end (and one of the biggest complaints about Endgame was that it was a near-perfect rehash of Death of the Family's story beats). Heck, technically this was even the inspiration to create the backstory of Injustice: Gods Among Us.
• Harsher in Hindsight:
  • In this story, the doctor tells the Joker that he has been diagnosed with cancer and that he would try and repent in the last weeks of his life. It turns out that the doctor had been pulling his leg all along and that the Clown Prince of Crime is going to live after all. Ten years later, there's Batman: Arkham City, whose prequel comic tells us that the Joker has been diagnosed with the Titan disease that he had inflicted upon himself six months ago and is told that he has only another six months to live. Six months later, and this time, he dies from Titan poisoning right at the end of the game itself.
  • One of the items on Joker's list of things to do is "kill Lois Lane". In Injustice: Gods Among Us, Joker doing just this would result in Superman's Start of Darkness and thus the Regime's birth.
• Hilarious in Hindsight: The Joker makes a comment that soon his tumor will claim him and he'll be deader than Pokémon. In 2001, the Pokémon franchise was going through a slump and was seen as just a passing fad, but it would eventually not only recover, but go on to become the world's biggest multimedia empire. The fact that just like Pokémon, the Joker also ends up surviving after all only makes this funnier.
• Moral Event Horizon: Expected for the Joker, but he uses it intentionally by getting the Jokerized residents of Arkham to all gang up on Robin with intent to kill just to get the Bats' attention.