They'd find out I am more of a nerd than they suspected. Then they'd find all kinds of porn, gore, and questionable stuff. Text files full of insane rants. Video games. Star Trek fanart. No regrets though. I'm dead, and if my hard drive traumatizes them, it's their own fault for looking at my stuff.
First they would find a password-protected BIOS, then a truecrypt volume with 3 other virtual truecrypt volumes within the first one, each having a different password.
Then if ever they get past all that they would find horrible things like terabytes of dicks and cum
Depressing Existentialist stories, furry art, all my photos from my various trips to various nature preserves, all my school shit, the history of stupid videos I watched relating to video games and terrible comedy. I think I covered everything