OK...first, if you have a water cooler at work, and it still uses the free paper cups....cut very tiny tiny slit in the bottom of the cup..so that it slowly leaks out on the unsuspecting victim.

This is one I do about once a month. If you work in an office where someone answers the phone...tape down the little button thing that pops up when you pick up the handset. So, while the person has picked up the phone, it will still continue to ring, and they get panicked. Quite funny.

For those of us that are more computer literate, change someone's screen saver to say something cheesy....or 'fresh' or something, then password protect it so the user can't change it back.

For people that pack their lunch...bring something strange from home, and put it in their bag...don't ruin their food, but, put another container in there filled with something else.

OK, you could always forward someone's house calls to the office, but that means you have to know their voice mail password. I changed my friend Tina's voice message on her cellular phone to a specially created outgoing message- one I designed for her! I about crashed the car doing it, I was laughing so hard (but I didn't crash, and am now very careful).