Back when I was the IT Manager for the US Courts, one of my happiest memories was installing the "Blue Screen of Death" screensaver into a server that my Systems Administrator had, after many days, finally gotton configured and ready for use. He came back from lunch and almost had a stroke when he saw the Blue Screen of Death.

On April1 many years ago, I sent a message to all our users asking them to stay away from their keyboards during lunch because we were going to clean out the network with compressed air and they might get little "ones" and "zeros" on their clothing. Some believed it.

My friend Suzy played the best trick ever on one of our secretaries .... you will have to do this on a computer that has one of those anti-glare screens on it, though. One that looks like this: www.jwodcatalog.com/imgLg/70...37840.jpg

Then, you make some jet-black paper, by leaving open the copy machine and hitting "copy" a few times. Take your toner-rich paper and trim/add more until you have a solid sheet of black the same size as the glare-reducing screens.

Next, remove the glare screen, and securely tape the black paper to the back, so when you put the glare screen back on the monitor, all you see is black -- i.e. like the monitor is off and/or the computer's off.

Wait for your victim to try turning on his/her computer and watch the fun transpire ... depending on the user's level of computer savviness, he or she will be reduced to a pile of curses and frustration in either a very short amount of time or a very long amount of time.

or you could always use the classic "changing the menu language to Russian or Chinese or any language other than English" trick ....

or change the screen-saver to something cute like "I like dick" - then password-protect it and set it up to screen-save after only a minute's worth of time ...

not that I've ever tried any of these things ... *ahem*

Take a snapshot of your friends desktop and use it as the background and then stick all of the desktop icons in a folder in your C: drive. That drives 'em nuts usually... no matter how much they click....

Also replacing the most common words in a fellow employees Microsoft Word program with extreme profanities so when they type 'and' it will automatically correct to 'cocksucker' or other such filth.

I got alot more but those are in the top ten. ;)