I once replaced the desktop of another guy's computer with this. It was policy in our Computer Support office to lock the machine when you got up, because people could just sit down and have full admin rights. He always left the machine unlocked for hours/days at a time and we had the habit of changing his desktop pictures around. At the time, he had been gone for a few days (machine unlocked) so I replaced the desktop with this. When he returned, he logging in and registered the change with an "awwwwwww Gaaaaaaaaawwd" and never forgot to lock the machine again.