1. The Chairhorn content.clearchannel.com This classic dates back to the early days of office pranks.Buy a regular air horn and some duct tape. Get to work 10 minutes early and tape the air horn to the middle tube on the chair base. Get your camera phone ready because when your coworker shows up and sits down, the air horn will go off, scaring them half to death, and getting earning you a great laugh from those in the vicinity. 2. The Gas Man img.thesun.co.uk Sometimes you really want to embarrass your coworker, and what's more embarrassing than uncontrollable gas?What you do is slip some Green Gas into their hot food or hot drink and wait for the inevitable to come. Within 10 minutes it'll sound like the horn section of the symphony is in the cubicle next door. Just be sure to cover your nose! 3. The Ugly Mug i1.huffpost.com This is the "Kick Me" sign of the future. If you don't want to invest in a commercial version, tape a message to the bottom of your target's mug telling the world what you think of them. If you like ongoing pranks, change the message every day, and keep the inside joke going as long as possible. 4. The Cubicle Prison i.huffpost.com Move a nearby cubicle wall to your targets cubicle, creating a 4th wall so they can't get in. If you've got a coworker who likes to sleep on the job, try locking them in rather than out. The metaphor of the Cubicle Prison will become all the more real at that point. 5. Rubber Bandit weirdomatic.com Put rubber bands around the phone. Taking calls will take a little bit longer with this one. 6. The Unlicensed Vendor fanpop.com This "Office" inspired prank involves convincing the guy who refills the vending machine to let you prank your friends, or else picking the machine's lock.Once opened, replace the food items with your target's desk belongings. Encouraging your coworkers to buy the items afterward is a bonus that should be encouraged. 7. The Office Sprinkler metro.us Turn your target into a sneezing mess with this Sneezing Powder.Just dust a bit of this powder on their keyboard, mouse, or tissues and as soon as they touch the powder it becomes airborne, and the effects begin! 8. The Desktop From Hell cdn.instructables.com When your target is out to lunch, sneak into their office and take a print-screen (Ctrl+Print Scrn)of the desktop of their computer. Paste (Ctrl+v) into Paint Shop, then under File, set the picture as the desktop background. Once the background is set, hide all of the shortcut icons so that when they go to click on the image of the icons, nothing happens. 9. 3rd- Person Auto-Correct cloud-4.steampowered.com Change the auto-correct on your target's emails to correct "I" with the target's name. This will make it seem like the target refers to themselves in the 3rd person. For example, "Allen want you to finish that report by Friday." When they notice (hopefully months later), they will start looking through old emails and be more embarrassed the more they read. In the meantime, silently enjoy the joke, and maybe send them the occasional email to coax a 3rd person response out of them. 10. The Liquid Nightmare ww2.hdnux.com The Liquid Nightmare is a powder that you add to hot food or hot drink. Pour some into your targets coffee or lunch and watch them try to drink it. It’s enough to make anyone lose their appetite when the blob slips out of their cup and hits them in the face. YUCK! You can also try replacing your coworker's favorite beverage with a frozen version when they are not looking. Go Forth and Conquer img.deseretnews.com Now that you've got yourself an arsenal of pranks to pull, go out and make us proud!