Toggle alarm to scare intruders? My coworkers always tell me to lock my Mac when I get up from my desk, or they'll mess with it. I think it's pretty obnoxious that I have to lock my computer each time I get up for anything, and of course, they messed with some of my settings recently.

I was thinking that, to get back at them, I'd purposefully leave my computer unlocked, but toggle some sort of siren to trigger if any button is pushed (except for some kind of preset escape sequence to disable the alarm). Is there some sort of app that would help me accomplish this?
Might be interesting if you have a MacBook...

http://mac360.com/2011/05/free-add-motion-detector-security-to-your-mac/


  iAlertU is an alarm system for your Apple MacBook that uses the built
  in motion detection to trigger the alarm and the iSight to capture the
  image of the thief. Among many other features, it incorporates the
  ability for users with iPhone, iPad, or iPod Touch to connect to and
  control iAlertU remotely.