Re: Stuff you like to believe happened in Nolan's series
I like to think that Joker was taken into federal custody after TDK. It makes more sense than him being the only patient in Arkham. I like to think Gotham is a level of Limbo and all the characters are facets of Cobb's personality at different stages in his life.
"Come!" he roared back. "Come kill me, if you can."