Funniest Coworker Prank You've Done....

[Monster Dave]

What's the funniest prank that you've ever pulled on a coworker?

[Sinister]

A bunch of years ago, I was working at a shop on a big mold tool program (carbon fiber wings and such).  As that program started to wind down, a fellow manufacturing engineer, Ed, started joking that he was going to get laid off, as he had been hired specifically for his experience in this technology.  We joked about it for a while, all in good fun.  Then, I ended up on the swing shift, keeping tabs on some big parts we had on a machine.  Well, there were times that I didn't have lots to do, and I started looking for trouble I could start. 

One night I decided to pack all of Ed's stuff into cardboard boxes and stack them on his desk, so he would see them first thing in the morning.  I made sure I was gone before anybody got there.  The word I heard, later, was that Ed saw the boxes, flipped out and started stomping through the plant looking for our manufacturing V.P.  Luckily, a guy who knew what I was up to, stopped Ed before he could give the V.P. what for and walk out.     Had some good laughs about that one.

[ducatiz]

at my old firm, i had an office next to this fat guy who would loudly belch after lunch.  and not just once, but for the next 10-15 minutes.  you could hear it down the hall, and having our doors next to each other made it so i could hear it loudly -- when i was on the phone, people could hear it.

the walls between us were not permanent, they were the kind that get put up for office division -- full height to the ceiling, but they are hollow for wiring and can be taken down.

i got sick of his belching.  it was nauseating.

i finally opened up the wall and put a small speaker inside one of the metal tracks that held the wall up and screwed it to the metal frame.  i ran the wires to my desktop PC. 

it worked far better than planned.  the metal frame carried the sound of pigs oinking so you couldn't tell where the sound came from.

every time he burped out loud, i hit the hotkey i made for a WAV file, and his burp would be answered by a pig  going WREE WREEE OOOOIINK WREEEEEEEE

he had building services in the office several times, they could not find the source of the sound.  of course, i didn't do it every time he burped after a while. 

...but it was hilarious listening to him talk to building services complaining about "pig noises" and having to demonstrate his burping to get the pigs to answer..

i never told anyone at work that it was me.

[the_Journeyman]

That's great izzzz!

JM

[sno_duc]

I served a machinist apprenticeship in a large plant back in the 70's. Machinist's are know for make the beast with two backsing with their co-workers.
So anyway a couple of defintions; Dykem Blue = a thin blue spray paint used for laying out work, Prussian Blue =  a purple vasaline like stuff that is resitant to most solvents and cleaning agents.
  We were working the lathe line, an aisle way with 20 or so lathes on each side. Ricky another apprentice was running the lathe in front of mine.
Early in the morning I heated a paper clip with a Bic lighter and sealed the nozzle on a can of shut, then I drilled a new outlet pointed backwards in the nozzle stem on a can of Dykem Blue. This can was set aside for future use.
All morning and into the afternoon every chance I got, I would apply liberal amounts of Prussian Blue to Ricky's lathe ( clutch lever, feed lever,...) and under the draw handles of his toolbox.
After second break, Ricky at this point is livid, I grab the special can of Dykem and walk over to to Ricky shaking the can loudly the whole way. Explaining that I felt bad about everthing I had done that day. I hand him the can, go spread eagle with my hands against the wall, and tell him to give it his best shot. He mashes down on the nozzle, doesn't notice the lack of blueing on my back until blueing is dripping off his elbow. Of course there were about 30 or so other machinist and apprentices on the lathe line who had been watching all day, they all broke up laughing.

[mitt]

back in the days we had unix stations, we could run remote applications on other peoples machines if you new their machine name.  We had a lot of fun running audio scripts with "I love porn" and other vulgar messages.

mitt

[ZLTFUL]

Worked in a warehouse pulling orders and the like. We had a very heavy duty shrink wrapper that will come into play later in the story.

Lunch time you ALWAYS took your clipboard, keys, pens and utility knife with you otherwise the following would happen...
Wrap clipboard in shrink wrap then wrap it in tape so it looks like a giant ball. Wrap pens and keys in another tape ball and then take the utility knife and wrap in another tape ball. The utility knife one would then usually be suspended from a webbing of tape above the seat from the cage on the forklift.

Our warehouse supervisor was also a VP of the company we worked for. Someone once made the mistake of dong the tape ball to him one day when he was helping pull orders. At lunch, that persons forklift had the forks removed, and then the forklift was place on the shrink wrapper and top to bottom completely. The perp's other gear was tape balled and then the VP took that mess and suspended it from the ceiling 25 feet up using a high lift.
A note was then taped to the shrink wrap ball that was the forklift stating simply, "I am the VP for a reason."

[Triple J]

I worked in an engineering office where a lot of guys chewed Copenhagen, including my office mate.

During a softball tournament a month or so prior to this, he had broken the bone in his upper arm. It was a spiral fracture, so he had a "clamshell" device on which kept his right arm immobilized next to his body.

One afternoon when he was out I grabbed his can of Cope and sprinkled a fair amount of Cayenne pepper in it, and shook it up. He returned, grabbed his can, and headed out the door to go to a meeting with the City. He wasn't supposed to be driving due to the clamshell, and the fact that our company cars were stick shifts, but he was sick of having to get rides, so this day he said make the beast with two backs it and drove.

So after the meeting he was sitting at a stoplight, waiting to get on the freeway...a circular "clover leaf" style on-ramp. While at the light he thought a chew sounded good and threw one in...followed by the light turning green. Apparently he got half way up the on-ramp before his lip started burning pretty bad. Unfortunately for him, since he only could use one arm and he needed to steer AND shift with it, there wasn't much he could do to relieve the burning. Apparently he stuck his head out the window, and attempted to spit out the chew, while driving/shifting, and dropped it down the side of the car and his shirt!  Everyone in the office was laughing their asses off when he told the story after he got back. 

I never ever left my Cope unattended from that day forward. 

[Blackout]

A few years ago when I was still living in California I caught a big black widow spider and put it in a jar. For some reason I brought it to work one day and sat it on my desk for all to see. My supervisor at the time was a woman known to be terrified of spiders. She remarked about it sitting on my desk and asked if that was safe to have around. I assured her it was. The next day I found a black spider-ring thing one of my sons had. I cut off the ring part, released the black widow at the back of the yard and put the fake spider inside the jar. Naturally I thought it would be a great idea to bring it in to work the next day. I carried the jar into my supervisor's office with the lid off. I pretended to be mad at her about something and flicked the spider at her. She flipped the make the beast with two backs out...I shoulda been fired for harassment. Fortunately she could take a joke.

[Popeye the Sailor]

A few years ago when I was still living in California I caught a big black widow spider and put it in a jar. For some reason I brought it to work one day and sat it on my desk for all to see. My supervisor at the time was a woman known to be terrified of spiders. She remarked about it sitting on my desk and asked if that was safe to have around. I assured her it was. The next day I found a black spider-ring thing one of my sons had. I cut off the ring part, released the black widow at the back of the yard and put the fake spider inside the jar. Naturally I thought it would be a great idea to bring it in to work the next day. I carried the jar into my supervisor's office with the lid off. I pretended to be mad at her about something and flicked the spider at her. She flipped the make the beast with two backs out...I shoulda been fired for harassment. Fortunately she could take a joke.

I would've taken a swing at you. I hate spiders.

[rgramjet]

While building a house, my wiseass job foreman decided he wanted to contradict me in front of the subs, basically trying to make a shortcut repair instead of tearing something out that was flawed.  Pissed me off.

He ate some weird Chinese food that day and visited the Porta-John at least 6 times.  The last time he went in, as soon as I heard the door latch, I lit a 100 pack of Thunder Bomb firecrackers that I kept in my truck for such occasions, and dropped them down the vent in the Porta John roof.  The smoke, the splashing of nasty blue/brown/yellow water and a sawed off little Hondurean falling out the front of the porta john with his pants halfway down brings a chuckle every time I think about it.

After the smoke cleared and the pants were pulled up, I asked him if he still thought we could "get away with" a built up post instead of a solid wood post.

[hbliam]

After enduring a few weeks of pranks from the other cops on our shift (my partner thought if we let it pass they would quit) we finally got tired of it.

We waited until they got dispatched to the hospital to guard a prisoner that was in the ER. We logged ourselves on the computer as out at some location on the west side of town and then hauled ass to the east side where the ER was. I happened to have a fart bomb (like you get from the ice cream truck) in my possession. All of our cars are keyed the same so the fart bomob went under the passenger seat and the doors were all locked. Then all the door handles got a liberal dousing of pepper spray. 

An hour later they showed up at the main station. With eyes red, and noses running, they proceeded to tell everyone what had just happened to them. They got into their car and were shocked at the smell. They immediately tried to cover their noses until they could get the smell out of the car. This of course transfered the pepper spray from the door handles to their faces. Needless to say they never messed with us again.

[Jaman]

I worked in a "boiler room" type operation with 5-7 other guys, 80+ hour workweeks were typical, with the other time spent together drinking...

except for 1 guy... who was kind of a tool. He REALLY loved his food.  He would make this sandwich every day.  It was a work of art, his pride & joy.  He would go on and on about how much he was going to enjoy devouring said sandwich.  Seriously, to hear him talk about it, it was like sex for him.

one day, he was going through his foreplay/ritual/lead-up to intercourse with said sandwich, whipped it out, then stopped, and announced 'I gotta go take a big dump, so i can enjoy my sandwich properly", and LEAVES his sandwich out in the open, all lonely & alone... sitting on his desk.

I get up, stroll over, gently unwrap, and take the BIGGEST F*7%-N BITE I can, gently wrap it back up, give it a little pat, and go sit down, awaiting his return, still chewing & thinking to myself, Damn, that IS one fine sandwich!  Everyone in the room is cracking up...

He returns, sits back down, begins to unwrap, and... the look on his face, before he explodes in anger, was priceless.

[metallimonster]

When I worked as a Audi tech we would do all kinds of pranks.

The standard wipe down the handles of someones tools with lube,  honk the horn while they're under the hood, all sorts of things.

My favorite was putting a air hose coupler into the cap of a empty bottle of windshield fluid and then attaching the hose to it and throwing it under a car or putting it next to someone working.  Man those things are loud when they explode.

[Grampa]

Many years ago, I worked at a car dealership. One of the parts dept clerks was dating one of the mechanics....... everybody knew it, but they pretended like they could not stand each other. The mechanic was a total asshole, nobody in the shop liked the guy. The clerk was a nice girl, very churchish, but had huge self worth issues. So in an attempt to give her a lil push  away from him, and to get back at him for be'n a dick, a few of us got together and set him up. One of the lot guys found a shitload of porn in a newly acquired used car. Real gross stuff. The mechanic would often walk next door to have lunch, so one day while he was out, we hid a few of the magazines under the passenger seat of his car. The plan had been to drop hints to her about his secret addiction to porn, but  later that night, when the two were out, driving to one of their secret dates, the magazines slid out under the passenger seat, hitting her feet.   


Same dealership..... I would take my lunch to work with me all the time. About once or twice a week, stuff would come up missing from my lunch. Mostly sandwiches. Back then, be'n poor, I ate a ton of pb&js.
After a couple of weeks of finding shit missing, I decided I'd had enough. My brother in-law at the time owned a dental lab, so I hit him up for some of those tablets that turn your teeth purple (to show you where plaque is). I crushed them up and added them to a red raspberry and peanutbutter sammich.  The pig in the office was easy to spot that afternoon.