The nice thing about the Joker is his drastically different portrayals make sense within the continuity since he's batshit insane 
I really love how in No Man's Land he's pretty silly and goofy, then at the end he throws a baby at Gordon's wife, shoots her in the head, then walks out looking dead serious and says "I surrender".

I really love how in No Man's Land he's pretty silly and goofy, then at the end he throws a baby at Gordon's wife, shoots her in the head, then walks out looking dead serious and says "I surrender".