Found this by accident. It doesn't pertain to DR specifically but RPG's in general. This one I felt could TECHNICALLY pertain to DR. The rest are at the site the link leads to:

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Rule # 197:

Projectile vomiting should not be an attack any character should have.

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http://games.sub-standard.com/unwritten%20rules.htm

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Your mind hears Druesyllia thinking, "{faintly}" "got somebody's weapon that died"
Your mind hears Rallyne thinking, "how did the weapon die?"

LOL! My favorites:

Rule #45:
No battle anywhere should begin with me asking, "Is the bad guy wearing pants?"

Rule #86:
The halfling Ninja is not a thrown weapon, even if he insists he is.

Rule #126:
GM Note: Any character that has 'Amnesia' as an excuse for not writing a background is just asking for you to abuse them.

Rule #199:
Pun wars have collateral damage and innocent victims.

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Mr. Gorbachev, tear down this wall rank!

Vote for DragonRealms on Top MUD Sites: http://www.topmudsites.com/vote-DragonRealms.html

In a similar vein to these, I've always found this list to be really funny:

http://theglen.livejournal.com/16735.html

Warning though, there are 2200 or so entries and I think he still adds to it. The link is to the first 500, links to the continuation are at the bottom of that post.

One of my favorites from the first 500 is still:
50. Not allowed to use thermodynamic science to asphyxiate the orcs' cave instead of exploring it first.

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Player of Leech Farmer Nithhogr