joker outsmarted a fifth dimension imp and took 99 percent of his power with it he was able to reshape the world and other worlds maybe even the universe as he saw fit, to get the spectre out of his way he placed him into an area that was fragil as can be and if the spectre tried to escape he would cause severe damage to the universe.
joker has created kryptonite from scratch :P he also poisioned lois lane in order to make supes kill him by driving him over the edge it was just a trick that batman revealed but he almost succeded in messing with supes head to the point of committing murder.
joker's venom was able to infect circe the goddess and she turned all the male heros. into animals wonder women had to beat up supes i think to stop him. He also jokerized solomon grundy, lex luthor, i believe he jokerized metron a new god, and even doomsday, and his venom could infect all forms of life like the T virus :P. Plants, animals, bugs you name it.
joker took some of the scarcrows gas and was not affected at all since he seems to have no fair then he went on to beat the crap out of the scarcrow with a chair
Joker like hannibal lector seems to know things that others have to really look into to even find out about, like in batman long halloween he seemed to know who the killer was before even bats or anyone did.
Calender Man was the Hannibal Lector part in that.
Joker was just gonna fly a plane to a crowd of people assuming Holiday had to be there.lol
That was so funny.
I loved the part in that when Joker went up to a mob guy in the bar, then when the mob guy reached for his gun, Joker pulled his out and said mines bigger.