There are certain keywords that it won't let you use in your posts that will generate (IIRC) a bad gateway error with no explanation.

After wanting to bang my head against the wall a couple of years ago I realized that your post cannot contain the word "poker."

I'm guessing that's an anti-spam measure and there are probably other words that will prevent you from posting as well, so your penis enlargement edge idea is probably going to need to be reworded.