Transcript for Jared Leto on Playing 'Twisted' Joker in 'Suicide Squad'
Oscar winner Jared Leto. This character has been written about, acted, interpreted, reinterpreted. Reimaged for 75 years so to be asked to take the baton and run with it was quite an honor and a responsibility so I dove pretty deep, you could say. Reporter: How deep? Let's just say there was no clowning around. Leto fully immersed himself as the joker committing to never breaking character while on set. When you take on a part like this you become the detective and journalist in a way and I have to say, it was the role of a lifetime. It was the most fun I think I've ever had. He's so demented and crazy and complicated. You learn a lot about me. Learn a lot about you or the character? Well, I guess what I think is fun but, yeah, he's a sick, twisted but I think very lovable joker. Reporter: So lovable that you'll rarely find yourself rooting for him even when he gives you chills. Ha, ha, ha. The laugh. You just nailed the laugh. How did you come up with that. A lot of experimentation. A lot of bad laughs. I remember wandering the streets of New York and Toronto shooting and I would just laugh out loud and see how people would react to it. When I started to hone in on this laugh I realized it was the one that really people would turn around and be like what the hell is that. You were so immersed in the character. How are you able to break from that character and actually say good-bye to it after you're done filming. I don't think you really say good-bye. I think the joker is in there somewhere. It is? I feel like -- Now I'm scared. You should be. I feel like this film is an introduction to the joker and I'm hopeful that we will see more to come. Reporter: For "Good morning
This transcript has been automatically generated and may not be 100% accurate.