There is no scientific evidence that vampires exist. There are no documented cases of people rising from the dead and feeding on the blood of the living. While absolute proof that vampires have never existed is impossible, it is most likely that they are entirely fictional.
There are people who fantasize about being vampires. Vampire clubs and vampire-themed bars exist, where people can dress up and drink blood-colored drinks. In extreme cases, would-be vampires drink a small amount of blood from willing donors. There have also been cases of serial killers who drank the blood of their victims, often earning them the nickname of "Vampire."