Bill Murray was fed up with the studio and director Harold Ramis on the set of “Groundhog Day,” so he went very out of his way to keep them out of his way. After simply not answering phone calls and being late to shoots, they suggested that Murray hire a personal assistant that could serve as a go-between if he wasn’t willing to talk with them himself. Murray ended up agreeing to the suggestion and hired a “deaf-mute who spoke only American Sign Language.” In his explanation, Murray told the studio not to worry because he was going to learn sign language himself.
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Source: Weird Facts