Prosthetics pioneer Jack Pierce was charged with turning Boris Karloff into bolt-headed bruiser Frankenstein's monster in Universal’s 1931 monster hit, and again for the 1935 sequel. Famously cranky, Pierce got on well with Karloff. In the days before Kindles and iPods, four hours in the make-up chair could be an ordeal, but the actor collaborated closely with Pierce on the look. He removed a dental plate to give Fro-Mo’s face a caved-in appearance and had a false cranium coated with cotton, collodion and greasepaint. Not only was he scary, he was highly flammable.