Well, if you’re really free (and horrible) and your friend aren’t around and you so happen to be in front of his or her computer… That’s a lot of conditions to satisfy right? Anyway, you can try this Windows XP prank on them. April Fools in coming. It would be a good (and yes - horrible of course) idea to right a program that can take screenshot and set it as a wallpaper. It would be loads of fun for the prankster and waste lots of time for the victim.
The Fastest XP Prank EVER!!!! - The top video clips of the week are here
It probably wouldn’t work if someone try it on me since I do not use the desktop anyway. I switched off icons on the desktop and only use the start menu. Until some expert discovers how to prank my start menu in less than a minute, I’m pretty safe coming April. 
Hehe, nice. I even didn’t try yet to make the icons disappear
by Nafcom (Mar 8, 2007 at 6 AM)I like that joke lol. I’m gonna try it.
by Milky (Mar 17, 2007 at 4 AM)I know how to prank your start menu! Run msconfig and delete the shutdown button!!!
by Ruiqi MAo (Sep 1, 2008 at 2 AM)