How to impress my best friends parents?

Well, i am going over to my best friends house tomorrow and i really need some tips on how to impress them because they think i am like, satanic. I am a very liberal, democratic, and a very mature minded 13 year old girl, and so is my best friend. Her parents, on the other hand, are very conservative, republican, " your going to hell " type people who really don't understand us. How do i show them I'm really not satanic, insane, hormone crazed teenager they think i am without straying too far from who i am?