You wanna play? –The Joker, from The Dark Knight
For I must have my other half
Or my life is not a life
I find that I must have them in my life
Let them be the light to my dark
The only world where the Joker isn’t the bad guy is in one of the alternate universes where all of the Justice League were the bad guys and so all of the villains were the good guys.
It was a trippy world.