Teachers have been showing movies with historical value to add to their lessons. Parents argue that they should only be showing PG-13 in schools. Last I checked, there are no 13-year olds in high school (except for the really smart ones in China). In addition, an rated R movie only requires adult supervision. And even though they might not always act like it, ALL teachers are adults. More importantly, why are we submitting to parents calling the shots on curriculum issues?