There is a group of ladies who work in the accounting department at my job who have made it their mission to decorate the cubicle of whoever has a birthday on a given day. They come in at 6 am on someones birthday and decorate, leaving a mess of balloons and streamers, which is a nice surprise the first time it happens (they do it every year). Well, we in the IT office decided it would be fun to booby trap one of our cubicles so that when our birthday rolled in, they would receive a surprise of their own. So we set up a webcam as a motion detector, and had the computer speakers turned up as loud as possible, so that when motion was detected, the honorable Admiral Akbar would yell "It's A Trap!". We succeeded in scaring the pants off of them, and also annoying them because the sound did not stop until the program was exited, so they had to listen to it the entire time they did their setup. It was priceless xD

Not an office prank, but still makes me laugh..

When my oldest daughter was about 8 months, she loved slapping the keyboard on my wife's laptop. More times than I can count with my hands I received a phone call from her asking how to rotate the screen back from upside-down.

Pwned by a baby

A few years ago, we had a developer who would come in early and leave by four almost every day. I can't remember how exactly it started, but we would put up a picture of a different dragon on his cube wall almost every night.

He was a pretty laid back/passive guy, so we took bets on how many pictures there would be on his walls before he took one down.

3 dragon figurines on his cube walls and 11 full color pages later, we had a winner.

CEO once thought it would be hilarious to give everyone Christmas bonuses in the form of little brown paper bags filled with fifteen hundred $1 bills.

Was a little awkward trying to deposit. 👯‍♂️

Part of the new hire process was all salaried employees had to work all hourly position jobs for a day (over a several week period, not all in one day) to really understand what we do.

I once hazed a new network admin who was working in the call center and I sent his station a pop-up message:
“Ha! Fire me will you!! I planted this virus and if you don’t enter the password in 60 seconds I will erase the database.” The pop-up had a counter counting down from 60.

This was over the lunch hour, so all the supervisors and managers were away and ‘Mark’ in a panic ran into our office (I was hiding under my desk)

Mark: GUYS!!...GUYS!!!....OMG!….Where the frack is everybody?!!!”

He runs out.

I peek out the door window and about a second later he’s running down the hall with one of the vice presidents. Mark shows the VP the message, VP looks over at our office, sees me…laughs and walks back to his office (not saying much to Mark).

Mark not knowing what’s going on watches the counter…3...2…1….
”Just kidding. Welcome to the company!”

Ahhh…the repeated sounds of “You son of a -bleep-!!” never sounded so sweet.

I was working at a doctors office while going to (and still attending) college. Everyone knew my major was computer science which meant everyone came to me when their browser didn't open. The night before April fools I turned off all of the wireless mice and used a label maker to print out "April Fools" on the bottom of each mouse next to the "on/off switch." This prank is miniscule in comparison to others here I'm sure, but the next day was my day off and I had the entire office calling me asking me to come in and fix it. "Taco what do we do???" They frantically asked. And so I very calmly said, "Did you turn the mouse over?" And hung up.

Heartless

I was 15 years old and the first year of high school. Everything was new to me and I was such a newbie. At that time I had 2-3 year of programming behind me at an institution where they taught competitive programming. And I knew something about computers. Not much but more than most of my school mates. At that time I wanted to become "super cool hacker".

So we had this very very thought teacher for history which was also our form master. She really knows how to explained everything about history and in an interesting way. But while she was teaching we also had to write down notes from her powerpoints that were on a projector. And occasionally she would wait for us to copy everything and then move on with her lecture. But sometimes she didn't. This was frustrating as hell. The whole class would complain about this because you couldn't take notes down normal, you had to do it at double speed.

But she got one weak spot. She was not very good with computers. Our school computers were locked in some kinda closet so that students didn't have physical access to a computer and were also password protected. So I came up with the plan to plant wireless mouse in her computer so that I could control her mouse. At that time it seemed like SUPER HACKER MASTER PLAN.

So I got an opportunity one time when she left the classroom and let closet where the computer was open. I quickly sneaked the USB of the wireless mouse in the computer and then go back to the seat.

So THE FUN began.

Firstly I would only go back in powerpoint so that all my schoolmates could write down notes including me. And it was hilarious to watch when she didn't know what is happening. So then I would move her mouse when she tried to close some window. I would just move it slightly so she wouldn't notice that somebody else is controlling mouse. And by missing X button just by slight she would click other things and other things would pop up and now she had to close this thing so it became a nightmare for her. And she would become angry at the mouse and start complaining how the computer doesn't work and that mouse doesn't obey her.

One time when she didn't pay attention to her computer and projector I went to paint program and drew a heart and wrote we love you (In Slovenian Imamo vas radi -> See the picture below) and one of my school mates has the picture of it. We were all giggling and she didn't know what is was for. And I managed to close everything before she even noticed.

So it got to the point where she couldn't hand it more so she called our school IT guy so that he would check her computer (2 or 3 weeks passed before she called IT guy). And he didn't find anything. He was really crappy IT guy in general. So one week passed by and I still had messed with her mouse. So she got a replacement computer. Who would guessed all the problems went away (because I didn't have another mouse like that). I guess when our IT guy took the computer to his room and really thoroughly check it he found my USB.

So he told her what was the problem she was so pissed off really I didn't see her pissed off so much in all my 4 years in high school. She demanded the apology from whom did it. And at that moment my mind went through all possible scenarios... And the most likely one was that I was going to be expelled... And I didn't have the balls to say that I did it and I was too afraid... Thanks to God nobody from my school mates didn't tell that it was me.

While she waited that somebody would come forward there was one moment when our looks met and at that moment both of us knew that I was the one that did it.

Next day the whole class wrote the apology letter and she accepted it. But for the rest of 4 years whenever was there a problem with the computer I had to fixed it and she didn't trust anybody not even our IT guy at school. It was our unwritten contract that I would repair her computer to pay off my sin that I did. And she once even trusted me with her personal laptop.

So to end this story I have really high respect for her because she is a great teacher and great persons that guide me through my teen years. And we stayed in contact.