Well cinematically 89 Joker was intending to kill everyone at the parade.
True but I thought you meant just killing random individuals. I equate Phoenix enjoying the riots at the end with the 89 parade or TDK ferries. The difference being the chaos that follows Phoenix isn't orchestrated, it just sort of follows him like the wake of a ship. Which *might* even be scarier.
Ledger was asking random people to blow up each others boats.
Comics most famous is the talk show audience from DKR.
Yeah, and I guess 89 Joker was the most randomly homicidal. I forgot about all the beauty products that he was tainting just to kill people for no reason, lol. The literal definition of killing at random. A different take on the character to be sure.