Well, even though this has been taken care of, I'll throw in a few pebbles anyways.
@"nerd", you're just being childish. It is true that peoples common sense deviates from one another -- but how hard is it to have common sense on the internet? Don't do anything illegal, don't do anything to piss people off (especially when they own and run the forum in question, the one which you seem to be active on).
@"Senpai", as he said, it does change from person to person, and while I do think that guidelines are nice, I think that it's up to you. I personally think the whole "Use common sense" rule is a lot better on the staff, and is a lot easier than having to fallback on hard coded rules. But that's just me. Perhaps when you say "use common sense," there should be an asterisk.
Use common sense.
[size=xx-small]don't do illegal things, and don't be rude.[/size]