Correct grammer but not culturally acceptable

0 I am a student and was given an assingment that I am finding difficult to accomplish. My instructer told me to post my question and see if any of you could help me. I need two examples of a piece of language (e.g., sentence) which is grammatically correct but culturally (from an American point of view) unacceptable. Only one of my examples may be lexical (e.g. at the level of the word), the other example must be at some other level of grammar (e.g. morphology, syntax, etc.). If anyone can help it would be greatly appreciated. 0-