I have yet to get either of my daughters to watch GF, in spite of my telling them how good it is and in spite of being here on the BB.
However, they did catch the "horse's head" scene when I just told them to "look at this" and they didn't know what was gonna happen. To this day, they do know and are grossed out by that one scene. Other than that I don't think they know much else about GF. What a horrible mother I am.
TIS