Joker is throwing a party, and the whole circus is invited! Dick, still feeling the effects of having Raya die in his arms, arrives to Amusement Mile to find Joker quite pleased with what he's done with the place, but he's taken the liberty to add his personal touch to it... which includes filling up the big top with the corpses of many past circus members... damn.
Spotting Joker mingling among the corpses, Dick basically gets pushed to his ledge and says "fuck this," deciding to attempt to end this whole situation, throwing many, are they called wingdings still? Sure. Those, towards Joker's head, they all miss, or rather get stuck in the corpse Joker hides behind. Joker's rebuttal ends up being a series of explosions, filling the tent with his toxin... then even more explosions, sending Dick flying out of the place... and then more explosions!
Dick wakes up in a haze to find visions of Jokerized Jimmy and Raya taunting him, and in a rage, he lunges himself at Joker, starting to beat the shit out of him (remember that one time when Dick killed Joker?) But Joker points out that he wasn't even allowed to get to the punch line... As he says this, Dick notices he's surrounded, all the members of Haly's Circus have been infected by the Joker, who stabs Dick in the leg, leaving him at the mercy of many of his friends, coming at him with all sorts of weapons.
Perhaps worst of all, the little girl Dick swore he'd protect is also amongst many of the circus members infected with the Joker toxin... Joker gives her a special spiked mallet, and that's pretty much lights out for Dick.
Then, as Joker drags Dick away, in a scene we're all to familiar with, Dick finds himself being presented with a silver platter...