Tim Curry, who starred as Pennywise in the original It, recently revealed that bronchitis cost him the role of Joker in Batman: The Animated Series, a role that eventually went to Mark Hamill. And while it's difficult to imagine anyone but him in the role, at the time the Star Wars actor was unsure about whether Warner Bros. would hire him to play the Clown Prince of Crime. Luckily, his laugh won out in the end.
"I figured there was no way they'd hire Luke Skywalker as the Joker," Hamill told The Hollywood Reporter. "So, in a way it was very freeing. I had great confidence at the audition because I thought there was no way I could get. I thought, 'I'm going to give them the best damn Joker they've ever heard and they're really going to regret not being able to cast me.'"
Casting and voice director Andrea Romano told Hamill, it was his laugh, which he developed during his time on Broadway, that earned him the role. "I had been playing Amadeus for almost a year on the road," he said. "On those shows, you can't change the words but I would play around with the laugh. Because of the play, I had an arsenal of laughs for the Joker."