If you could add or remove one "good manners" rule, what would it be?

Once you choose, that rule would start (or stop) being an expected societal norm automatically and would become embedded in culture (or fade into obscurity).

It could be a big crazy change like making food fights be a normal or even polite thing, like if the food is good then you are supposed to ask for more and then throw it and start a food fight, and that's a big compliment for the chef.

Or it could just be something you personally find more convenient, like making is so that nobody is expected to remember people's names anymore, and people will tell you their name again whenever they talk to you so that you don't have to remember it.

If you could add or remove one good manners rule, what would it be?
If you could add or remove one "good manners" rule, what would it be?
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