Putting all the patients false teeth in a bowl together to soak on a dementia ward. Took us weeks to try and match patient to teeth, no, they weren't marked up with the patients names . Doubt the right teeth ended up with the right patient, it was guess work.

Tried to retrieve his lighter from a deep fat fryer with his hands. boy was that fun to clean up.

I used to work for a landscaping company and over the course of a summer I witnessed one of my co-workers accidentally set 3 different things on fire (a hedge trimmer, a truck, and himself)

At a Petco all the Guinea pigs were in a big plexi-glass enclosure with a center divider. Boys on one side and girls on the other. An employee decided that all the long haired Guinea pigs should be on one side and short haired on the other. It took forever to sort them out and all the females were pregnant.

I worked at a company with a shared inbox. One guy sent all of his emails with a distinct font and color. He was super untrustworthy and sucked at the job. One day he sent an email to a customer from the shared inbox but put my signature on it, to make it seem like it came from me instead of him. He left the font and color the same as all of his other emails. He didn’t last long there after that.

Annual sales meeting. Brand new guy is seated next to the CEO. He proceeds to put his head down and fall asleep on the table. During the meeting. They woke him up at lunch to fire him.

Removing the plastic wrapping from a pallet of 5 gallon cans of (highly flammable) acetone. He didn’t have a box cutter so he proceeded to melt it with a lighter

The designer, creative director and head of production all missed that there was an eight day week on a calendar. We sent 10 000 copies of a useless calendar to a client. Rightly so, they refused to pay for it.

Had a coworker land a plane on the edge of the runway. Like the starting edge. Cracked a landing gear leg and bent a turbine blade in one engine. Then the scatter brained old moron doesn’t log it or tell anyone. Just parks it and walks away. The next crew doesn’t notice the damage, because it’s really not easily detectable. So they go flying and get a bunch of weird s**t going on with the port engine. When they turn back, the f*****g gear wouldn’t lock down. Fortunately they were able to get on the ground and stopped without making themselves or anyone on board dead. All we did was fire him. No reports to our regulator, no criminal complaint about his conduct. In hindsight I should have made those complaints myself rather than leaving it to our management.

I hired a new employee on Friday and gave him directions to the job site for Monday morning. He got there early and helped thieves load all of the building material on their truck and take off. The webcam showed him stopping traffic so they could leave.

Working in pharmacy, a pharmacist gave a customer a flu shot and threw the used syringe in the container with the new syringes instead of the container to dispose them. Another pharmacist went to grab a new syringe later on and ended up getting stabbed with the used syringe. Caused a total s**t storm.

Not a mistake necessarily, but I once witnessed our chief accounting officer (and our only accountant; it was a small company) type in values into two Excel cells, pull out a calculator, add the two numbers together in the calculator, and then type the answer in a third cell. She had apparently been doing this for years, with sheets consisting of thousands of rows. I explained how to use formulas and copy them but she apparently forgot because I saw her doing the same thing again months later.

I worked as a Radiation Protection Tech at a power plant that was re-fueling. My job was to sit outside of a contaminated area and if anyone wanted to take something out of the area (tools, etc.) I had to make sure it didn't have any radioactive particles on it. To do this you wipe the tool with something like a tissue and then hold the tissue up to a machine called a frisker. If the needle on the frisker goes above a threshold then the tool has to be cleaned or left in the area. One day I come back to relieve a guy who had been sitting outside the area for 2 hour. He tells me there's been no issues and everything has cleared. I look at the frisker, lean over and turn the machine on.

I was working in an open plan office that had a small kitchen area at one end, microwave, kettle, sink, toaster and water cooler. We saw one of the managers fiddling with the toaster for a while, looked like she was trying to clean it. It never occurred to her to remove the crumb tray, she was poking around inside it with a knife while it was still plugged into the wall. People just sat back and watched, wondering how long before she got zapped. Then she turns on the tap and lifts the toaster towards the sink. Someone stepped in then to stop her. You might just write this off as someone being a bit dim but she was the Health & Safety Officer for the building.

Was making pizza. Guy broke the pizza board(the thing with the handle you make the pizza on and then slide the pizza into the oven) I found the other one and he lost that. So I told him to make pizzas on one of the plastic cutting boards. He put the pizza into the oven on the board and just left it. The board melted No more pizza that day

Poured sink cleaning solution into the ice cream machine instead of the cream mixture and I had to stop them, they then said "I'm sure it'll be fine, it was only a little." No that would poison people. I had to clean out the whole machine top to bottom and refill it. I ended up throwing away nearly a whole bucket full of contaminated ice cream mixture. I would also like to add that the containers didn't look anything alike, the sink stuff came in big plastic jugs with screw tops and the ice cream comes in carbord cartons (like orange juice) that you have to cut open. so I don't know how she could have possibly mixed the two up.

I worked for a non-profit that hired a guy in fundraising purely “for his rolodex” and they couldn’t care less about any of his job functions as long as he kept bringing more rich people to fundraiser parties. Well when the pandemic hit and we were forced to go remote, it became clear how incompetent he was with technology, and how he’d been coasting for years in the office by sticking to phone calls instead of email, etc. We had our first major online fundraiser coming up and I warned my boss that this dude had no idea how Zoom worked - never muted himself, camera up the nose, treated it like watching a YouTube video. But again, he was the guy inviting all the rich people to the event, so they didn’t want to “lecture him about a computer program” and “hurt his ego”. Then in our massive 200+ person zoom event, he set his laptop on the bathroom counter and proceeded to take a shirtless, nasty old man dump complete with grunting, splashing, and squelching. It was so loud it drowned out the speaker. They had to end the event early because they had no way to mute him and it kept going for a full two minutes with no sign of stopping. I nearly threw my laptop out a window that night.

I knew a guy who was a foreign exchange dealer in London. He made a trade but apparently forgot to press go (or whatever) When he got back from lunch the company had lost £10m. The whole department had to work together all afternoon/evening to make enough to cover his losses so he wouldn't be sacked. A hell of a team building exercise. ;)

I don't know exactly the problem, but my wife and I had a house built, 3 months after our closing the company that installed the HVAC wanted to do a routine maintenance as part of the warranty. The guy came in and looked at the system setup in the attic and just "oh this is Jerry's work" in a very apologetic voice and scheduled someone to come out and redo 90% of the work before the warranty began. I don't know what Jerry did, but it was apparently well known in that company to likely need to be redone.

I worked on a golf course during the summer. Area with lots of poison ivy. Two of my coworkers were instructed to weedy a river edge area. If we encounter poison ivy, we either stop what we are doing or go get full suit protection with respirators. These dumba**es were weedwhacking in the thickest poison ivy I had ever seen. No protective suit or glasses or respirator. I roll up and notice what the hell they're doing and point out all the poison ivy everywhere- they were aerosolizing the oil. They both ended up in the hospital on steroid to prevent their death because of the oils they inhaled.

Tried to cool down hot oil (in a chute, all ready to be emptied) with a nice big bucket of water…..I heard “THOMAS NO” only to turn around and see a GEYSER of hot oil shooting towards the ceiling before it hit and splashed down around him. Nobody was hurt some f*****g how Edit: because it has come up, the chute that the oil was in was on wheels and had a wooden handle, it absolutely didn’t need to be cooled lol

My wife worked at a gas station and found out her coworker, who had been there for years, had been refilling the napkin dispenser by cramming them one at a time through the front slot. She walked up and unfastened the back and apparently his jaw hit the floor. He had never considered that there might be a better way to do this.

The office we worked in was shut down due to covid and the company went 100% remote. A new senior engineer was hired to work directly with our product team and also manage a team of developers. During our company wide weekly zoom meeting after he was done presenting for the company he turned his camera off but forgot to put him self on mute. 100+ people heard this man playing Fortnite and talking down about the company to someone else in the background among other things. He only lasted a month.

Wouldn’t say incompetent, but was quite an entrance. A new person joined and on day 1 remote was somehow able to delete the production teams entire Dropbox file directory, which was about 25 TBs of video, design files, production files etc. Was about 2 tense weeks working with Dropbox to get it back, but yeah that new person was uncomfortable…

I have a list a mile long of the s**t our completely incompetent project manager did, but the best was insisting that a $3000 load of fertilizer still absolutely had to be delivered as previously scheduled despite the company warning against it as we were expecting heavy rains that day. The entire pile was washed away within a couple of hours.

I worked with a guy who “cut” the grass on the greens of an entire golf course with the mower blade off.

Took the wrong coffin to a funeral. Someone else had to drive to the cemetery with the correct deceased on board, and thankfully they made it before the viewing.

Emptying hot fryer oil into a plastic container. Guess how that went

Not a coworker but a lab partner in school. We were making bacteria cultures and the teacher was explaining that the petri dishes were sterile. "So don’t, like, open it and smell it, don't touch it with anything but the swab...." Moron immediately picks it up and smells it. We failed. He sells cars now

A coworker I had put a 250k horse on the walker and forgot to turn the electricity on. Horse broke out and went hell for leather across the property and jumped a fence ONTO the pavement. Thank the gods I had 2 other competent workers with me to catch the animal without serious injury. A week of ice boots and poultice later and he was perfectly fine. But that could have gone soooooo wrong soooo fast.