I just remembered collecting these „rules for roleplayers” for a convention where I was part of the organizing team.
The rules were a big hit and I started copying them for most attendants of said convention and adding to them for the following years.
Sadly this convention died a few years ago, but I think it is worth a try to translate the rules into the English language for your enjoyment. If you want to add to these rules – please feel free.
1. Set long-term goals for your characters:
“When I reach level 15 I become a megalomaniac”
2. Let your Gamemaster know that you heed the advice and warnings he presents:
“OK, I open that door – what’s the amount of damage I take?”
3. Take care of the faithful companions of your character:
Player 1: “The next to enter the Tavern is…”
Player 2: “I get my horse to the stables”
Player 3: “I take care of my horse and pay the stableboy”
Player 1: “The next to enter the Tavern is…my pony!? Damn, I forgot that..:”
4. Don’t give up a good hiding place for nothing!
Player 1: “I introduce myself: I’m Sarah”
Player 2: “I’m Chen”
Player 3: “I’m still hiding behind the shrubbery”
5. When hiding your Identity, take care you know your alias!
“I’m called Darius of…where have we been in the past week?”
6. If you cannot rely on your senses, rely on logic!
“I think this isn’t a pyramid, this is a circle! – Left is faster then the outer track!”
7. When looking for top secret information – a subtle approach is always the best!
“Hey there, merchant! I heard you are selling slaves?”
8. If you’ve got to much information, trust your intuition for sorting out!
“I didn’t think that vision I had was important.”
9. Make your equipment list clean and accessible!
“Can we ignore the last 40 GP – then I have a nice clean amount…”
10. The well being of your friends should always have a high priority.
“While I pass her, can I see if she’s bleeding to death?”
There will be more - unfortunatly not all of these rules stay meaningful when translated, but I'll see what I can do.