Discontinued Award
The next time someone at the office wins an award, send out a memo to everyone that the award has been discontinued.

Self Recognition Prank
Without disguising your voice, compliment yourself over the office intercom. Compliment yourself on a just completed task or give yourself the rest of the day off.

Screen Capture
Take a screen capture of someone's screen. It would work best if they have a program open. Then save the screen capture as an image (Ctrl+PrintScreen) and use that as their desktop background picture. It will confuse the heck out of them when they see their desktop icons over their Microsoft word.

Fictional Awards
Send out memos congratulating people for dumb reasons. Tell them they won an award. Awards for Best Filer or Paper Sorter, etc.

Monitor Settings
Every day, while your co-worker is away from his desk adjust his monitor settings so the brightness goes down 2%. At a rate of 2% a day from 100%...in about 2 weeks the brightness will drop 20%. See how long it takes him to notice the change.

Copier Paper Fun
Type in giant bold letter "Copier Needs Service Soon" and make a few copies of the page. Then place the papers back inside the copier paper tray.

Fake Ads in the Company Newsletter
Use the ad section of your company newsletter to post fake bulletins. Place an ad for Windows 98 software still in box for $500 OBO. or maybe a desperate plea for someone to buy your timeshare condo. Be creative!

On Hold Music
Change the 'On Hold' music that your office uses for the phone system. Put it on a Death Metal station or even better, put it on a foreign language station.

Post A Fake Job Ad
Use the internet to post a fake job ad for your co-worker's current position. Use CraigsList or HotJobs or any other free online site to do this. Leave the coworker's contact info as the response on the ad.

Full Of Nuts
Fill a co-worker's desk drawer with packing peanuts. Empty the content of the drawer out first, so you can add more peanuts.

Booby Trap Desk
Booby trap your victim's desk by attaching a piece of wire or thread that goes from the phone, wrap around the back of the desk and attached to the leg of the chair. Scoot the chair all the way in. When your victim pulls his chair out, he will knock the phone behind the desk.

No More Germs!
Post a memo in everyone's mailbox to announce a new policy to keep germs out of the office. Tell them tomorrow there will be a free keyboard cleaning session from 10am-noon in the 2nd floor meeting room. Just remind them to unhook their keyboard and stop by anytime during the session to get their keyboard cleaned. Then prior to people arriving, go and place a sign on the meeting room door that reads, "Will Return In 15 min." Be sure to walk past there a few times during the fake session and see how many people were duped and are actually waiting for nobody to return in 15 min.

Fake Note
Leave a note on your victim's desk that read, "I need those PDK numbers ASAP!" Your victim will not only wonder who the note is from, but will also wonder what the heck PDK stands for.

No More Ink
Remove the ink from inside the pens and put them all back in the box.

Problem With Chair Wheels
Use some black tape to tape up the bottom wheels of your victim's desk chair. This will make it difficult to move the chair. Most people will never take the time to look and fix the problem and will just leave it at a nuisance.

Sinking Chair Prank
Most office chairs nowadays have a pneumatic piston used to control the height. The chairs are also designed to use a person's weight to control the downward adjustment. So, while your victim is away from his chair, tape the height adjusting lever to the bottom of the seat. This will make the piston lock and when your co-worker takes a seat, he will end up sinking all the way to the bottom.

McDonald's Application Prank
Fill out an application from a fast food place like McDonald's and put your co-workers name and contact info on the form.  Then just wait till his cell phone rings and McDonald's calls him to setup an interview.

Speak Up!
Tell the new employee that a certain someone else is hard of hearing so he better speak up every time he talks to him. Tell that certain other person the same exact thing about the new employee. Then watch as they communicate with each other in high volume every time.

Waiting For My Document
Put a chair so it faces the printer then sit there all day long and tell people you are waiting for your document.

Waiver
Whenever someone in the office asks you to do something, ask them to sign a waiver first.

Courtesy of: PrankSite.com