Unwritten rules are the small courtesies nobody teaches in school but everybody notices when they are broken: keep your phone audio to yourself, don't hijack a friend's big day, return what you borrow. A popular AskReddit thread asked people which unspoken rule they wish everyone knew, and the answers read like a handbook for sharing buses, offices, shops and friendships without driving each other mad.
Below are 22 of the best suggestions from that thread, grouped by where they matter most, with a little context on why each one works and where it needs common sense.
Why unwritten rules matter
Most social friction is not caused by big betrayals. It comes from tiny moments when one person's comfort quietly costs someone else: a loud video on a train, a cart blocking an aisle, a question that lands badly. Sociologists call these shared expectations norms. They are rarely written down because most people absorb them by watching others, which is exactly why people who were never shown them can break them without meaning to.
The American anthropologist Edward T. Hall, who coined the word proxemics in 1963, showed that even physical distance follows hidden rules. In his scheme, the "personal" zone for chatting with friends runs from roughly half a metre to just over a metre, while strangers are usually kept further away. Nobody signs a contract about it, yet most of us feel uneasy when it is ignored.
The Reddit list is light-hearted, but almost every item boils down to one idea: notice how your behaviour affects the people around you, and adjust before they have to ask.
Rules for offices, shops and public transport
Shared spaces are where small habits have the biggest audience. Several of the most upvoted rules were about them.
- Leave the fish out of the office microwave. Reheated fish fills a whole floor with its smell, and the people sitting nearest have no way to escape it. Eat it cold, eat it at home, or pick something milder for the workplace.
A workplace notice shared on Reddit made the same point with humour: only cracker fish and sweets shaped like fish get a pass.
- Park your trolley to one side. Stopping in the middle of a supermarket aisle turns a two-way path into a queue. Pulling over to read a label costs you nothing and keeps everyone moving.
This tidy shopper, a small dog riding in a child-sized trolley, at least kept to the edge.
- Use headphones for anything that isn't a phone call. Music, games and videos played aloud on a bus or in a waiting room force everyone to share your soundtrack. If you forgot your earbuds, it can wait until you get home.
- Respect personal space. On a half-empty train, sitting right beside a stranger or leaning against them reads as intrusive. Most people prefer a buffer, and Hall's research suggests that preference is close to universal, even if the exact distance varies by culture.
A dog patiently enduring a very enthusiastic hug sums up how many adults feel when a stranger gets too close.
- Buy a plunger before the day you need one. It is the least glamorous item on any shopping list and the most urgent one when a toilet backs up, especially in a shared flat or when you have guests.
Rules for conversations
A second cluster of suggestions dealt with what we say, and what we should think twice about saying.
- Don't swipe through someone's phone. When a friend hands you their phone to show one photo, look at that photo. Scrolling sideways can expose private pictures and messages they never meant to share.
- Keep comments about appearance to yourself. Pointing out a blemish, weight change or a crooked tooth rarely helps; the person almost certainly knows already and usually can't change it on the spot.
- Never ask a near-stranger when the baby is due. Unless someone has told you they are pregnant, don't guess. A wrong guess is mortifying for both of you, and even a right one may be news they were not ready to share.
- Don't tell someone without make-up that they look tired or unwell. It turns a choice into an implied flaw. If you are genuinely worried about a friend's health, ask how they are doing instead.
- Return the question. When someone asks about your weekend, answer and then ask about theirs. It is the simplest way to turn an exchange into a conversation.
- Unasked-for advice carries little weight. People are far more open to suggestions they requested. If you think you can help, ask first whether they want ideas or just want to vent.
Rules for friendships and favours
Friendships run on small acts of fairness. These rules keep the ledger balanced.
- The third time you borrow something, buy your own. Borrowing a drill once is normal. Borrowing it every month means you need a drill.
- Whoever cancels does the rescheduling. If you call off plans, the next move is yours. It shows you still value the meeting and spares your friend from chasing you.
- Don't take someone's last piece. If a person has a single stick of gum, slice of cake or cigarette left, don't ask for it. They will feel awkward refusing and may resent saying yes.
- Don't propose at another couple's wedding. The day belongs to them. A proposal pulls the spotlight away and puts the newlyweds in an impossible position.
- Let harmless joy be. If someone's hobby, outfit or habit makes them happy and hurts nobody, people or animals, there is no need to comment. Leaving them to enjoy it is a kindness in itself.
- Be gentle with strangers. You rarely know what the person in front of you is carrying, whether that is grief, illness or just a terrible day. Patience costs little and can matter a lot.
Rules about safety and health
A handful of answers moved from manners to matters that can genuinely protect lives.
- Never let a friend drive drunk. Take the keys, book a taxi or a ride-share, or let them sleep on your sofa. The same goes for anyone you see about to get behind the wheel after drinking, if you can step in safely.
- On the road, be predictable rather than polite. Waving another driver through when you have right of way can surprise the cars behind you or a cyclist the other driver can't see. Clear signals and following the rules of priority are what keep traffic flowing safely. The original commenter put it far more bluntly.
- Tell your doctor and your lawyer the whole truth. Both can only help with the facts they have. Doctors base treatment on what you report, and lawyer–client confidentiality exists precisely so clients can be, in the usual legal phrase, "full and frank" with their advisers.
Hugh Laurie's Dr Gregory House famously assumed every patient was lying. Real doctors would rather not have to.
- Stay up to date with your vaccinations. Vaccines protect not only you but also people who cannot be vaccinated, such as newborns and some people with weakened immune systems. If you are unsure what you need, talk to a doctor or pharmacist.
The joke that closed the list
- You do not talk about Fight Club. The final entry is a nod to Tyler Durden's famous first rule from David Fincher's 1999 film, based on Chuck Palahniuk's 1996 novel. Premiere magazine later ranked the line among the greatest in movie history, and it has become shorthand for any secret everyone knows about.
It is a fitting ending, because it pokes fun at the whole idea of rules nobody is supposed to mention.
Myths and limits of unwritten rules
Myth: everyone already knows them. Unwritten rules vary by country, region, generation and even workplace. Taking food from a shared plate, standing close while talking or calling someone by their first name can be warm in one place and rude in another. When someone breaks a rule you take for granted, a friendly word usually works better than a glare.
Myth: being nice always means being polite. As the driving rule shows, the kindest choice is sometimes the predictable one, and honesty with a doctor matters more than sparing anyone's feelings.
Myth: these are fixed laws. They are social preferences, many of them shared widely but none universal. Some, like the fish rule, are about comfort; others, like drink-driving or vaccines, touch on safety and public health, where the stakes are much higher.
The useful habit underneath the whole list is simple: before you act in a shared space, take a second to picture the person next to you. If you enjoy reading about neighbours who handle shared life with good humour, try A Neighborly Exchange Between Two Couples.
Sources: Rules collected from the AskReddit thread "What is one unwritten rule you think everyone should know?" (also the source of the preview image); Wikipedia: Proxemics; Wikipedia: Attorney–client privilege; Wikipedia: Fight Club. Photos credited under each image.
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