Indian Vampire Worship.

I can see the end of the Bollywood movie now: old Granpa settles down and says "Thing I never could get used to about Pune, all the damn Vampires."

Of course Vetal the Vampire is a good guy who worships Shiva and bestows boons to his own worshipers. A 400 year old text has just been discovered that details the worship of Vetal.

See here for details.

Thanks to Tau Nemesius for the link.