Not all rules have to be written down and passed around in order for them to be important and worth respecting.Some rules are just隐含．
Reddit的用户u / SpareArm提出了一问题: "What is one 'unwritten rule' you think everyone should know and follow?"The thread, which now contains hundreds of these "unwritten rules" in writing, brings up a lot of great points.Here are some of the best:
1."Do not swipe left or right if someone shows you a photo on their phone."
- - - - - -u / whattheheckisdecaf
2."Buy a plunger before you need a plunger."
- - - - - -u / olafthebent
3."Don’t leave your shopping cart in the middle of the grocery aisle!"
- - - - - -u / M3ggsandbacon
4."Never make fun of someone else's laugh — be it how they sound or how they look.Laughing is the most natural expression of joy and happiness, and for someone to feel self-conscious about that because of other people's comments is so brutal."
- - - - - -u / ArthurMcSlothington
5."If you have to cancel on a friend, it should be your responsibility to reschedule."
- - - - - -u / Havoo
6."Don't propose at someone else's wedding."
- - - - - -u / LongliveLazarus
7."Don't ask for something if the person only has one left (gum, cigarette, piece of cake, etc.)."
- - - - - -u / anothersocialoutcast
8.“善待正在工作的人:食品工作人员、医务人员等。Don’t take your bad day out on someone else."
- - - - - -u / sas1013
9."Don't look through the fucking gap of bathroom stalls."
- - - - - -u / PatricktheVieiraYep
10.“如果有人小声说，你也小声回答。”
- - - - - -u / GalvanizedRubber
11."Don't cook fish in the office kitchen."
- - - - - -u / TiNYWalL
12."For buses/trains/any other public transportation, let people exit first before you get on."
- - - - - -u / miaowies
13."Don't say shit about someone's appearance if it can't be fixed in less than 30 seconds.Spinach in someone's teeth?Let a homie know.体型吗?坏的发型吗?穿旧的衣服吗?Don't need to mention it."
- - - - - -u / vaguelyhumanpotato
14."Leave it in a better condition than you found it."
- - - - - -u / Essexal
15."Don’t mess up an apology with an excuse."
- - - - - -u / MHE17
16.“尿尿。No matter what it is, pee first."
- - - - - -u / ChompyNuggets
17.Finally: "If you borrow someone's car, fill up the tank before you return it."
- - - - - -u / simplypsyched
You can read the full thread of responses onReddit．
Some submissions have been edited for length and/or clarity.