That should get your attention!  I did have a student who thought he was a vampire.  He would prowl at night and drink the blood of animals he would kill.  He would take his girlfriend with him.  I learned all of this from teaching in a non-traditional program.  I also had some other freaky kids who were Satan worshipers.  If you want to read more, first  you have to read my blog about my non-traditional classroom.  Then I will post more.  Enjoy!