Back by popular demand, we bring you another batch of funny pranks for the office that won’t get you fired– and just in time for April Fools Day! We know how tense the working world can get sometimes, and here at the GoGo HQ, we like to lighten the mood whenever possible, so what better time than now? If your coworkers are jokesters like yourself, try your hand at some of these practical jokes- computer and phone pranks included. Without further ado, we bring you Playful Office Pranks: Part II.

Before you decide to execute any of these prank ideas, it’s probably best to consider if your coworkers are the type that would have a laugh with you or freak out at the disruption to the day. Behold, our ‘should you prank your coworker’ decision tree!

Virtualize the Post-It Prank: In Office Pranks Part I we suggested the art of physically covering your coworker’s desk with post-its, but for an even sneakier attack, bring that prank to their computer desktop. For Mac’s, use the sticky-note application and for PC’s, use the chain “Start -> All Programs -> Accessories -> Sticky Notes” to infiltrate your coworker’s desktop with little notes of your choosing. Take the prank one step further and rename all of their desktop icons so that once they remove all the sticky notes, they’re faced with outlandish names for everything on their desktop.

Drawing a Blank: Turn the brightness setting all the way up and the contrast settings all the way down on your coworkers’ monitor, leaving a seemingly frozen screen for them to return to. Get ready to watch them freak as they think that their computer monitor has fizzled out on them.

Sneaky as a Mouse: If you’re looking for easy pranks to pull on someone’s computer, when your coworker isn’t looking, install a wireless mouse to their computer. When they come back, control the mouse from the desk over, and watch them ponder in confusion as their computer takes on a life of its own.

Make it Pop… I Mean, Stop!: For a prank that will drive anyone crazy, enable pop-up notifications on your coworker’s computer in 30 second intervals. They can say anything you’d like– make them think they have meetings coming up, notify them it’s time to shave that goatee they’ve been working on that you strongly disapprove of, tell them they look lovely today– no matter what the messages are, they’re bound to drive them up a wall. To enable pop-up notifications on a Mac, you can schedule them into the ‘Alerts’ application, and on a windows, use the chain Start > All Programs > Accessories > System Tools > Task Scheduler. You can make the notifications span five minutes or schedule them periodically throughout the day, just make sure the best ones come first, so if they catch on, they definitely get to see the best one.

No… You Called Me!: Commonly known as the Chinese Food Prank Call, if your office phone has the ability to make conference calls, you can prank two people at once. Dial one coworker’s extension, then quickly dial the other’s into a conference call. They will both answer at once while you listen in as the confusion ensues as to who called who- easily among our favorite phone pranks.

Catch Me if You Can: Every time your coworker leaves their desk, call their phone. Then, just as they’re about to answer it, hang up. Do this every time they get up and watch the frustration rise as they think they are just missing important phone calls.

Steve Who: Enlist the help of a bunch of friends around the office and have everyone call the same person with a message for “Steve.” They person will be totally confused as to how all of these people got the wrong number for “Steve.” Then, at the end of the day, have “Steve” call asking for all of his messages.

I ThINK Not: For funny pranks to pull on someone’s desk, using clear nail polish, paint the tips of every single pen and pencil at your coworker’s desk, so when they go to use them, they won’t write. (This is easily reversible using nail polish remover afterwards.)

I ThINK Not II: Pick up some invisible ink from your local gag shop (Five Below also sells it), and cover your coworkers’ important documents in invisible ink right before they return to their desk. Watch the moment of panic turn to relief as the ink fades away. This works just as well if you cover their favorite blazer.