If you have read the page spotting a real vampire. and are sure that they are one, casually tell the person that he or she has vampire eyes. If they smile when you say it then they odds are they already know that they are one, and even if you arent one you will have their respect for being able to tell they are one while knowing enough about us not to freak out about it. plus it will be a start to a good friendship.

If they get a confused look, they didn't already know and you have a little explaining to do. (not in a bad way) Just means you get to be the teacher, ask them about some traits that they may have i.e. things listed on the knowing if you are a real vampire page from this site. If they say yes to a lot of them and possibly start giving you the (how do you know that about me look), mention some of the parts that seem more unlikely.

around the time they give you that look tell them that they are a real vampire, if they didnt know then their probablly pretty white in color. So tell them to eat a medium rare steak to get the color back that they havent had in atleast a few years, also the effect they will feel from the blood will help confirm that you were right. They will be convinced after they eat it if they arent already. ( dont forget to tell them about this website) tell them the perks of being one, most people do not consider being told they are one to be bad news after being told the perks.

In the unlikely case they look mad or possiblly scared that you were able to tell explain that its not a bad thing that you know about it, that their safe with you knowing, and if you are one now would be a good time to be open and admit it to them. if their response is vampires dont exist, vampires are evil, im not one of those, your nuts, or something along those lines simply tell them to go to this site and leave it at that. if they dont say one of those things talk to them become friends and tell them this site can help a lot.