I've met the occasional vampire and, believe me, you don't want to be one.
The vampires I'm talking about don't turn into bats or suck your blood. They're a particularly obnoxious type of loser who drain your energy. They're the people who want the government to help them when they could be helping themselves, they're the people who want to borrow from you, either things or money, they're the people who don't bring them back.
These vampires have earned their own acronym. They're called PITA and that stands for Pain In The Ass.