If you work in an office with a suspended ceiling: Hide his phone in the ceiling tiles above your victim’s desk. When they arrive…give them a call!
Take all the chairs you can find from other offices, the conference room, etc., and fill up your victim’s office as full as possible.
Replace everything on your (male) victim’s desk with similar items, but make them as “girly” as possible (pink pens, lacy picture frames, bows, flowers, etc.). Remember to change his screen saver too!
Find a small rubber ducky, remove the jug from the office water cooler, and squeeze the duck inside. Replace the jug and wait for the fun!
Put confetti in your victim’s fan (tape the bottom to hold in the confetti if necessary).
Take a cup full of water and a jumbo note card. Hold the note card on top of the cup and turn it over carefully, placing it on your victim's desk upside down. Slide the note card out from underneath and the cup will be stuck there. (But be sure there is nothing nearby that can be harmed if it spills!)
Place a piece of clear tape over the microphone part of the phone. Laugh as your victim struggles to talk to their callers.
Using fishing line or black thread, tie everything on your victim’s desk--stapler, tape dispenser, pencil cup, etc.--to his chair. When he pulls the chair out, everything on his desk will go crashing to the floor! Or, attach everything on your victim’s desk to the back of one or more of his desk drawers (string the line through the holes in the top of the desk). When he open the drawer, all his stuff will go crashing across his desk.
This prank is for a co-worker who has an office with a glass window in the door. Find a box slightly bigger than the window, cut off one end and tape it to the door around the window (with the open end at the top). Fill the box with empty cans, balloons, packing peanuts, or other item of your choice. When your victim looks in the window it will look like the entire room is filled! For added effect, put a chair or something behind the door to make it hard to open.
Plug a radio into the power strip that your victim’s computer is plugged in to. Turn the volume all the way up. Now turn the power strip off. Your victim will at first be puzzled why their computer won’t turn on; and then will get a big surprise when they flip their power strip on.