Joaquin Phoenix's predecessors on TV and video say that cackle takes strenuous effort. The voice actor they revere? Mark Hamill.

For years, Andrea Romano gave a crucial note to actors who voiced the Joker on Batman: The Animated Series: Do not wear noisy shirts. "It was rare that someone would come in to do the Joker voice for more than 20 minutes who didn't end up bathed in sweat. It requires a tremendous amount of energy," said Romano, who served as the voice and casting director for that show, Justice League and other animated series. "You want to flail your

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