About 12.5% of America's 22 million 10- to 14-year-olds have seen grisly R-rated movies, according to Dartmouth Medical School researchers. In 2003, they asked 6,522 children if they'd seen 40 recent films rated R for graphic violence. 'Scary Movie' topped the list, with 48% having seen it. About 33% said their parents let them watch R-rated fare. Even among those whose parents prohibited R-rated movies, 22.6% had seen at least one film on the list.