Centaurs, Werewolves, and... Bloodsuckers?
Oh my...

Besides Harry Potter and Draco Malfoy, the two most opposing people in the world of magic would have to be Potions Master Severus Snape and former Defense Against the Dark Arts Professor Remus J. Lupin. During Harry Potter's third year at Hogwarts, a select few students discovered that Lupin is a werewolf.

Among these clever pupils was Gryffindor fifth year, Hermione Granger. "Once when Professor Snape was filling in for Professor Lupin-- sorry, I'm still used to calling him professor, he assigned us an essay on how to kill werewolves. It was supposed to be two rolls of parchment, but how in Godric's name could anyone explain all that werewolf information with just two rolls of parchment? But still, if the facts from our assignment didn't clue me, or anyone else for that matter, in, Professor Lupin's monthly sick days, the same days as the full moons, was enough to make sense of what was going on."

It seems as though Snape is a big, bad bully who let Lupin's secret out, but according to Hogwarts records, Lupin was a Prefect during his fifth year at Hogwarts. Many established people who held the same title during their years at Hogwarts know very well that it is a job that requires intelligence and the ability to think quickly. After reviewing the events of Potter's third year at Hogwarts, it is clear that Lupin is indeed subtle with his ways of payback.

But first, the term payback infers that a quarrel already exists between Snape and Lupin, which, as inferred, is true. When Snape is questioning Potter and Lupin about a piece of particularly old parchment otherwise known as the Marauder's Map, he scathingly glares at Lupin and suddenly asks if perhaps Harry attained the Map "from the manufacturers," obviously depicting that Snape already knows Lupin and his friends have something to do with the creation of the Marauder's Map. However, Snape has no reason to mention the "from the manufacturers" bit, but he still does because he and Lupin are long-time enemies as we later find out in Harry's fifth year at Hogwarts.

Furthermore, records show that immediately after Snape's werewolf essay had been assigned, Lupin returns to assign an essay on vampires. Also, just as Snape begins to interrogate Potter and Lupin (over an accusation made by Draco Malfoy that Harry Potter's head had been seen in Hogsmeade), Lupin seems to get annoyed and slightly uncomfortable by the whole situation and quickly makes his exit, with Harry, by telling Snape that he needed to tell Harry something about the vampire essay he assigned.

Lupin could have used a number of other excuses to escape Snape's interrogation, but he chose to use the vampire essay instead, and Snape did not question it.

And now fingers are pointed toward this crazy reporter or toward Severus Snape. Could he really be a vampire?

As most wizards know, Snape is the Head of Slytherin House. He lives in a dungeon, and besides the fact that he used to be a Death Eater, he is useful to Dumbledore for a reason that remains unknown to us for now. Perhaps this reason has something to do with his being a vampire, perhaps not. But the facts remain-- if a werewolf is able to roam Hogwarts and keep his identity secret, a vampire can, too.