Vampire Stories & Rules

Over the years, I have seen quite a lot of vampire stories in movies and on TV and new ones seem to pop up every now and then with a new take on the vampire genre (I just saw a new one on TV called moon light about a vampire private detective, lol) so my random question is that if you were writing a vampire story, what would be your 5 rules that a vampire lives and dies by, at least one rule needs to be original.