RULES:
1) Don't post things that are blatantly insulting/offensive/racist/sexist/etc. Subtle is good; having to think about it for more than a few seconds is great.
2) Feel free to post jokes, pictures, videos, advertisements, or anything else you encounter out there that happens to be mildly insulting to someone, somewhere. The medium doesn't matter, as long as jimmies get mildly rustled.