Be careful with parodies. I've written a few (wrote one in the trial too), and it seems that they aren't all that well liked unless they're brilliant (like, Tom Stoppard 'Real Inspector Hound' brilliant). My last one involved a sex-crazy sleuth, involving the mystery of the missing lightswitches. It ended in nuclear fallout. Scored a 20/25, with the comment "this was a stupid, stupid story. you're incredibly lucky your writing skills are fantastic, otherwise this would have been a 5/25 mark."
Damn serious teachers.