First of all, there are three species of vampire bats, and only one of them feeds on mammals: the common vampire bat (Desmodus rotundus). However, even this bat doesn't enjoy or seek out preying on humans - their fine dining meal of choice is the domestic cow. Vampire bats also never take enough blood to kill their prey... let alone turn them into creatures of the night.
And don't believe what that old horror flick might show you, either. Real vampire bats are not big terrifying monsters- they're itty bitty (and sometimes even adorable!) animals, only about 3.5 inches long and weighing only two ounces.
2. They've got some sweet moves.