The undead are here to stay...
If you prefer "real world" story lines and are observing the phenomenon as a baffled bystander, you might be interested to know that thousands of years before achieving mass popularity in movies such as Underworld and Twilight, and TV series like True Blood, vampires had manifested in pagan mythology, monotheistic demonology, and spiritual rituals.
Throughout history, vampire myths appeared in nearly every culture. From the ancient Middle East (Mesopotamia, Judea, Egypt), these archetypical baddies invaded Europe, where they found fertile soil in Slavic paganism, and also materialized in Africa, Asia, and the Aztec Empire.
"Awake, ye drunkards, and weep . . . For a nation is come up upon my land, strong, and without number, whose teeth are the teeth of a lion . . . Sound an alarm in my holy mountain: let all the inhabitants of the land tremble: for the day of the Lord cometh, for it is nigh at hand . . . And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the Lord come."
– Book of Joel
The vampire -- a human lookalike possessed of superior abilities, as well as frailties, dependent on man for sustenance, multifaceted and obscure -- remains an enigmatic figure. Friend or foe? Through him, we get to experience latent fancies and scenes in which the secrets of creation are unraveled. Thank heavens for fiction, I say. The world, I predict, has not seen the last of the vampire crazes. The undead are here to stay, our prolific imagination will undoubtedly continue to produce them, and even the most discriminating realist may yet cross over to the dark side.