The areas where I use humor are in rules you shouldn't have to "go to".
Example:
- Smoking is only permitted outside
- Smoking is only permitted outside - if you are on fire, go outside.
Both explain a rule that your guests will undoubtedly follow. If someone lights up at your table, you aren't going to pull out the rules, you will just tell them "no".
The problem I find, is that most people won't stand and read a bunch of rules on the wall (or in your pocket) unless there is something in it for them. A wall full of dry rules are for TD's to resolve an argument (not unlike the umpire carrying a rulebook in his pocket), but nobody is "expected" to read them. If you post something with entertainment value, more people will read it.
If an rule disagreement occurs, TDA or RROP rules on PDF are better than any book or wall posted rules, because you can go directly to the rule with a keyword search.