Workers Recoil After Finding 'Pickled Head' Inside Fridge in Office Prank

Anyone who works in an office knows there are unwritten rules to follow, from using people's favorite mugs to prime parking spots and taking advantage of the printer.

The shared kitchen is often a source of contention, with most agreeing fish should absolutely not be put in a communal microwave, and etiquette dictating you should never take a lunch that isn't yours.

But one team shook up lunchtime by pranking their co-workers—by putting a fake head in a jar in the fridge.

Summing up office manners, Northeastern University Graduate Programs shared their 21 dos and don'ts of the workplace.

On the prohibited list is replying all to emails, or overly using emojis and exclamation marks, as well as no gossiping or having private conversations at your desk.

Among the encouraged behavior was arriving early, dressing appropriately, making sure your headphones are properly plugged in before blaring music, and bringing in goodies.

It advised: "Who doesn't love to eat? If you have free time one night, baking cookies, brownies, or some other treats can be a really nice gesture for your coworkers—especially if you're celebrating a big win or going through a stressful period.

"If you do choose to bring in treats, though, it's important to understand ahead of time whether any of your coworkers have allergies or dietary restrictions like gluten insensitivity.

"Bringing something in that everyone can enjoy will only make the gesture that much more meaningful." Although it's unclear where a head in a jar counts as a "goodie."

The TikTok account @officialmysterymakers shared the viral video, seen here, which was captioned: "Never a dull moment at the office."

"Pranking the office, with a fake pickled head," the on-screen caption read. A hidden camera captures people's reactions, which range from screams and jumps, as people recoil in horror.

People were equally freaked out in the comments, as Nifa wrote: "I'd probably faint."

Alex T. noted: "Movies did it all wrong. It was the men that screamed."

British idiots commented: "I'm surprised the third one didn't do a taste test."

BlackRose said: "If I found that in the fridge I would just slowly close the door and pretend I didn't see anything and then wait for the reaction of the others."

Jennifer good admitted: "I want to do this, I work in a school, think I'd be sacked."

While Hannah Sarah asked: "Omg please tell me how you made this? We have milk thief at work so I need revenge."

A few referenced the recent Netflix series, Monster: The Jeffrey Dahmer Story, with As esu x replying: "I would pass out how scared I would be because iI watched Dahmer documentary."

While Jessie Morden added: "Omg I would have a heart attack because I am watching Dahmer at the moment on Netflix."

The TikTok account is said to be run by Mathilde Brix, and the clip amassed more than a million views since being shared last month, but it's not the most viral video by far.

The TikTok account is thought to belong to a troupe, based in Denmark, that organizes escape rooms, with some clips racking up 24 million views.

The account frequently shares themed content, as it seems colleagues regularly have to navigate pranks, while they also share what appears to be footage from the public trying to escape and work out various puzzles.

Newsweek reached out to @officialmysterymakers for comment.