Vampires, incidentally, do exist, even if Vlad was not one of them. I well remember the Hamburg Vampire in the middle 1960s. He climbed into a flat and drank the blood of a young woman, who asserted that before he came through the window she had felt a deadly chill and become unable to move. The skeptical police took her off to the hospital, where the Vampire was actually caught halfway up the creepers on the wall, on his way to have one more for the road. He ended up in a mental clinic. The victim and the police officer in the case ended up telling their story in convincing detail on German television.
NEAL ASCHERSON, "Dracula in Britain", Games with Shadows