Here is another trick you can do. Open a window that has tubgirl or goatse or whatever in it. Make sure the window is NOT fullscreen and is not covering any icons. Hit the Print Screen button. Open up Paint and hit paste. Save the screen shot and set it as the desktop background. If you do it right, the icons will line up perfectly and it will appear as though he has a window open. However, he will not be not be able to close the window. It will drive him nuts trying to figure out what's going on. He'll get even more pissed of when he reboots the computer and it's still there. Trust me on this one. My cousin was flipping out because he couldn't close scatlovers.com.

Haha... I've actually done that before... you can do something similar with some cell phones too... like how you can change the text on the main screen... just change the text to say "No Service" see how smart people are when they have all their bars and start whining about not having service