The Joker #1 gives readers a huge tidbit about the Joker's hideout: he has a security lock that's tuned to his unique laughter. Without the Joker's laugh, no one can get into his base. It's later ...

Maggin and Irv Novick. In this story, it's revealed that the Joker has a mini-Ha-Hacienda hideout under his Arkham Asylum cell that he can access at any time. While Batman and the police think ...