Jared Leto: "There are a lot of things. It’s probably better to not get into it but to the Joker, violence is a symphony. This is someone who gets an extreme reward from the act of violence and manipulation. Those are the songs he sings and he is very in tune with what makes people tick. I did meet with people that were experts, doctors, psychiatrists that dealt with psychopaths and people who had committed horrendous crimes, and then I spent some time with those people themselves, people who have been institutionalized for great periods of time. I guess when you take on a role, any role, you become part detective, part writer, and for me that’s my favorite time of the entire process, the discovering, the uncovering, and the building of a character. Yeah, it’s really fun."
"It was challenging but it was also fun. He has a great sense of humor, depending on who you ask. [Laughs]"