Is there any possible way that vampires could exist?

i dont think so.. on the other hand, their are several terms.. vampires, evils demons etc etc.. well i dnt knw abt everyone, butt vampires exist and they have their society somewhere in USA, and they have their own people with whom they react... just like friends bcm vampire and just tastes blood, not drink it like water... watch national geographic doc. on vampires.. thankuu