User blog comment:Tommy,Klaus&Kol2012+/Theory about Origin of Vampires(Comment if you have idea)/@comment-4054533-20120528164927

My theory is that some human wanted to be immortal so s/he made a deal with the Devil where s/he would be immortal but s/he would have to kill other people in order to stay that way.

Of course, it really doesn't matter because vampires don't exist but I thought I'd share.