Detect if there is someone remotely viewing your computer. (Taken from http://apple.stackexchange.com/questions/15945/application-to-notify-user-of-active-vnc-connection)

detectVNC.sh

#!/bin/bash

alertme() {
  say "Big brother watching"

  # If you want a Growl notification:
  # growlnotify --appIcon TextEdit "Big brother"  -m 'watching'
}

while :
do    
  netstat -a | grep vnc | grep ESTABLISHED && alertme
  sleep 60 #wait 60 seconds
done