Recently, Reddit user u/0_7_0 decided to find out what are the prime examples of common sense.
On July 13, they made a post on r/AskReddit, asking people "What is one 'unwritten rule' that you believe everyone should know and follow?" And it blew up.
As of this article, u/0_7_0's question has received over 3,400 comments, many of which are valuable tidbits we all should listen to. Here are some of the most upvoted ones.

#22

Never comment a person's weight, if they lost it, if they gained some. It's just very rude either way.
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392points
#23

Don't talk loudly on the phone while you're in public transportation, it's super uncomfortable for everyone
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390points
#25

Give up your seat to the pregnant lady on the bus/train (or to anyone else who needs it. Don't take up two seats because you like to put your feet/bag up).
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373points
#26

If you borrow a friends car or truck, always return it with a full tank of gas.
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318points
#27

Never ask a person if they're pregnant. It's just rude and you never know their medical history.
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318points
#29

When someone else is paying the bill, you shouldn't order something very pricey. (It's understandable if something expensive is the only thing you are able to eat.)
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293points
#30

When you are shopping/looking for clothes and suddenly decide you don't want it anymore, put it back where you found it. Don't just dump it somewhere — it makes life hard for both workers who are cleaning up and the customers looking for something to buy.
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283points
#31
If you make an appointment and can’t keep it, cancel or let someone know. I manage sales for a car dealership and we thrive on appointments. We understand things come up, just let us know. That simple gesture goes a long way.
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272points
#32

If your advice or opinion wasn’t asked for, don’t give it.
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247points
#33

If you are going to talk with someone about your problems/issues, do a quick check-in first. Like, 'Are you in a good space for me to talk this out with you?' I’ve used it a few times, and I think just the basic courtesy of asking is such a relief to people!
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231points
#34
The last of any food/drink is reserved for whoever bought said food/drink
Always leave stuff cleaner than it was when you got to it (campsites, AirBnBs, anything shared with people really)
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219points
#35
If someone can't fix an aspect of their appearance in five minutes or less, don't mention it.
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206points
#36
If you’re about to turn the light on in a dark room and someone is there, you have to announce what you’re about to do so the person doesn’t get a surprise. I feel like it’s really disrespectful to turn the light on without announcing it
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195points
#37

When walking through a store, treat the aisles like lanes on a road. Keep to the right.
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182points
#38
Don't bombard people with a ton of taking when they obviously feel tired and overwhelmed, they are having enough trouble with their own stuff, to deal with all of your stuff.
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161points






