Vampire Bat, The (1933) - Drained Of Their Life's Blood
The first proper scene, policeman Karl (Melvyn Douglas), who doesn't believe in vampires at all, conferring with the burgomeister (Lionel Belmore) and crew (William V. Mong, Harrison Greene, Paul Weigel), exposition in The Vampire Bat, 1933, also starring Fay Wray and Lionel Atwill.