It might have been upkeep of the technology, the complicated machinations of Mickey's head, the safety of the character performer, or simply the effectiveness of the illusion, but the real reason is anyone's guess.
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Mickey Mouse Spoke For The First Time 86 Years Ago Today When Mickey first hit the silver screen, he was quiet as the proverbial mouse. He was an instant success, and Disney decided to give him a voice. He first spoke in an animated short film called The Karnival Kid.