Fassbender guests on Late Night with Seth Meyers to promote Frank. He also talks about riding motorcycles, doing musicals, and wearing a mask in the movie.
That’s me, actually. It makes you sort of more mischievous, an anarchic streak that came out. But the reason that the character wears the mask is because he’s suffering from mental health issues, so at an early age, his father makes him this mask and never really takes it off because he feels safe in that sort of insular world inside his head.