I went to the silk market for the first time (a popular shopping place for foreigners). They had this sign posted near the elevator. I think it was for the Chinese merchants to learn some responses to foreigners who are bugging them (although in my experience, it's usually the other way around). I can't read much of the Chinese, but the English translations themselves are pretty crazy!
***Update...I asked my Chinese tutor what the title in white says and it's actually a list of phrases you shouldn't say. I should give them more credit! I should have recognized the first character anyhow. I think it's the same one that they use on no smoking signs.