History.
I hope to teach young noobs that the world and history as a whole is nothing but sex and violence and that metal is truth lulz. I'm going to love teaching though, I've already done some shadowing work during high school and I loved it.
Plus I hope one day for my students to go on some message board and say something like "My history teacher listens to Deathspell Omega, Merzbow and Regurgitate... is this awesome?"
BTW awesome choice of career, I've often thought of becoming a teacher...but at this point I'm trying more for teh muzik... still plan on doing it though, whether I fail at music or not, I don't want to be in a band forever