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.

#21

Never ask a person if they're pregnant. It's just rude and you never know their medical history.
0points
#22

If you borrow a friends car or truck, always return it with a full tank of gas.
Report
0points
#23

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.)
Report
0points
#24

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.
Report
0points
#26

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!
Report
0points
#27

When walking through a store, treat the aisles like lanes on a road. Keep to the right.
Report
0points
#29

Always space out by one urinal in the restroom.
- You might also like: 50 ‘Weird Facts’ About The World That Might Give You A Fresh Perspective
Report
0points


