From IMDb: It was reported that the rubber headpiece used for the Frankenstein monster make-up was very uncomfortable for Lon Chaney Jr. to wear. It sat directly on his forehead and he constantly complained. Once he asked for it to be removed. Angry and frustrated when no one listened, he ripped it off himself, tearing open a bloody gash in his forehead. Production on the film was shut down for a couple of days.

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