The Wolf Man (1941)

In this literate Universal Studios, moody black and white horror film classic from director George Waggner:

• the amazingly-effective transformation scene in which American-educated British heir Sir Lawrence Talbot (Lon Chaney, Jr.) became the werewolf - after being bitten by fortune-teller/ werewolf Bela (Bela Lugosi)
• and later being told by Bela's gypsy mother Mariva (Maria Ouspenskaya) that he was in danger: ("Whoever is bitten by a werewolf and lives becomes a werewolf himself...Heaven help you!") - in the scene, Talbot grew fur and paws for feet
• the exciting climax in fog-shrouded woods when the werewolf during a full moon pursued pretty antique shopgirl Gwen Conliffe (Evelyn Ankers) and was hunted down