What are some unwritten social rules everyone should know?

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When someone is paying for you, always get something cheap.

• Never shake a hand sitting down.

• Don't make plans in front of someone who is not invited.

• If someone asks you to delete their photos after sending them to you, delete them straight away!

• Always wait for people to tie their shoelace while walking.

• Don't force your belief on someone.

• If you have eaten the last bite of food, throw away the packaging by yourself.

• Don't point out someone's insecurities in a negative way.

• Protect who is behind you, respect who is beside you.

• Never eat the last piece of something you didn't buy.