http://users.adelphia.net/~kamel/Posting.html
Like seriously. Its amusing, but it pretty much sums up most of the forum rules in a video. The forums it talks about are the steam forums, but the moral behind it all can be used on any forum. Just check it out.
(NOTE: YOU DONT HAVE TO DOWNLOAD ANYTHING SO I DONT THINK THIS VIOLATES THE RULES, BESIDES, THIS SHOULD BE ADDED TO THE RULES ANYWAYS.)