Best practical joke you've pulled at work

The shipping ‘bags’ that are basically just plastic air bubbles..... I always love taping them onto someone’s tires and watching them freak out when they leave and hear ‘POP POP POP’

Around the 1990 I made a fake virus, just a little graphic program that I put in a co-worker's autoexec.bat file. I found out later that he had already been a victim of a real virus, so when he saw this, he completely fell for it. I was able to catch him turning on his computer, and I saw him silently staring at his screen, just steaming. After a few minutes I tried to explain that it was a joke, but it took several minutes for him to believe me. It worked better than expected!

Drew a giant dick on this one guys window. He didn’t notice it and was interviewing an entry level new grad female. It was behind him.

Worked at a hospital where collecting urine samples was routine. A male nurse put some apple juice in a urine sample cup and secretly placed it at the corner of the nurses station. He left for a few minutes and returned when several female nurses were at the station. He said “God I am dying of thirst!” Walked over to the urine sample cup with the apple juice and drank it down in front of the female nurses.
A few of the nurses started gagging uncontrollably until the male nurse started laughing his arse off and told them the truth about the apple juice.

i worked for IT on campus in the early 2000s when the internet was just starting to really be mainstream. a bunch of 20 year old guys just screwing with each other every day.

main thing was that if you walked away from a computer in the office unlocked, when you got back your desktop would be goat.cx, or lemonparty.

eventually i got a promotion to be a server admin so i had control of everybody's accounts, including my coworkers' student accounts. friend logged into class and i had used group policy to put an inappropriate desktop on all their accounts and one dude logged into a presentation station and had a bunch of naked dudes pop up in front of his class.

his retaliation was taking my keys out of my desk when i stepped away and parked my car in BFE and then a week later in my boss' spot.

Messing with people's computers left unlocked while they were away was always fun. I'd connect to the unlocked computer via MS Netmeeting and allow myself access to control their laptop. The great part about Netmeeting was that it wasn't incredibly obvious that someone was remoting into their laptop. Once the person returned, I'd crank up the volume to their music and blast some music. It was pretty great if you were nearby and could hear the person's reaction and the music blasting.

Another things I'd do when someone left their laptop unlocked was to get on the person's messaging app and start chatting with a coworker. I'd usually ask the coworker in the chat if I could borrow a few dollars for something. Later, that coworker would come by with the $ and the coworker with the unlocked scream would be dumbfounded.

In college, while another student worker was away, we'd change the browser homepage on their computer to some page that would start looping an audio that said "HEY EVERYONE! I'M LOOKING AT GAY PORNO!!!"

A former boomer boss hated tattoos, and deeply resented the younger generation for embracing them. She even wrote a policy banning visible tattoos.

I was the #2 at the time and bought a pack of fake tattoos before we visited one of the more distant locations where there was about 20 employees. I made the rounds to each employee and convinced them to put on a fake tattoo before our group meeting. The tats were not obvious- just a star behind the ear, a neck tat peeking out slightly above a collar, a wrist tat, and so on. But a young lady my boss hated the most agreed to wear a leg sleeve that showed below a skirt.

I knew the agenda was going to be rough so I did this to soften up the employees. My boss knew the news was rough too, so she was reluctant to raise overwhelming policy violations that were visible in the meeting during the meeting, but I could tell she was fuming.

On the drive to the airport, she was dramatically unloading about the issue. I added fuel to the fire about how disrespectful that was to her policy. She immediately decided to address the issue with the middle managers in that location and started to call them to bitch about it and belittle the managers. As she dialed the phone number, I asked her to check the date before unloading on them. It was April 1st. She took it well and took a knee.

An operator friend of mine played a really great long game one. He started complaining that his hip started to hurt and was half-limping around for weeks. Eventually he said that he had seen a doctor and was going to take a set off to have minor hip surgery but the recovery would be quick. Well a week or so later he comes back on shift and starts asking everyone if they want to see his x-rays to see the pins they put in. Of course everyone was like, sure let’s see em.

So he pulls out a picture of an x-ray and this guy has a couple pins in the hip. He also has a cock that hangs down damn near his knees. Everyone notices at the same time and the control room explodes in laughter. Obviously he was faking the whole time and had just been on vacation.

In the military, your ID has a chip that allows you to log into computers and other things. I put a piece of clear tape over the chip after one of my subordinates left it in his computer. Was pretty funny watching him keep inserting his card into the computer to get it working.

One of the funniest I saw was a coworker superglued another coworkers Styrofoam cup to the table. When he picked it up, the bottom stayed glued to the table, but the rest of the cup came up and spilled coffee everywhere.