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A little reminder Stick Post-It Notes all over every square inch of the victim's office. Helps if you have some accomplices.		Fill er up Get your hands on all the styrofoam packing chips you can. When the victim is away, tape off the entrance to his/her cubicle (making it into a square box) and fill the sucker with styrofoam.		Foiled again Get a gang of pranksters together with LOTS of aluminum foil. Wrap foil around EVERY single object in the victim's office, down to the last pen -- leave absolutely nothing unfoiled!

Sorry, no room
A great prank on someone who has an office with a small window in the door: Find a box just slightly larger than the window. Fill the box with a strange object (cans, golf balls, miscellaneous garbage) and tape the box on the inside of their such that it covers the window. From the outside looking in, it will look like the entire office is full of cans, golf balls, or whatever. If possible, place a chair or other heavy object behind the door to make it difficult to open.

Musical drawers
If you work in an office where everyone has rollaway drawers or files under their desks, wait till everyone is at lunch and then swap the rollaways until everyone has someone else's. If you don't have rollaways but have lots of time, you can also just swap actual desk drawers.

Going down
Use tape or string to tie down the height-adjustment lever on a coworkers chair. The chair will automatically rise to the highest position, and once they sit down it will descend to the lowest position.

Phantom paperclip
Place a paperclip in the copier and make several dozen copies, then place those copies in the paper tray. The next several people who make copies will assume there's a paperclip stuck somewhere in the copier and will drive themselves nuts trying to find it.

All together now
Clip all of a coworker's paperclips together into one long chain and replace them in the clip tray on their desk.

My kingdom for a pen
Paint all the tips of a coworker's pens and pencils with clear nail polish. None of them will work. (The polish can be removed later with nail polish remover.)

Desktop screenshot
Take a screenshot of your coworker's desktop. Save it somewhere you can find it later (not the desktop). Now create a folder on the desktop and drag all their icons into it. Hide the folder somewhere you can find it later (so you're not a complete bastard). Take the screenshot and make it the backgound image. Sit back and enjoy as the click on icons that are just pictures. Nerd fun!