Cameron Monaghan Practiced The Joker Laugh for Weeks Before 'Gotham' Filming

Cameron Monaghan poses with some pals while attending the 2015 Lights Camera Cure Hollywood Dance Marathon held at Avalon on Saturday night (March 21) in Los Angeles.

The 21-year-old actor was joined at the event by Jonathan Bennett and Kenton Duty.

Cameron recently opened up about his role as The Joker on Gotham, and how he perfected it.

“I’m surprised my neighbors didn’t call the cops on me because I spent those weeks constantly laughing and staring at myself in the mirror,” Cameron told ComicBookResources.com. “Even if I was driving in my car to get food or something, I was repeating the monologue. I allowed myself to be a crazy person.”

15+ pics inside of Cameron Monaghan, Kenton Duty, and more at the event…