NEW YORK, NY (AP).- A trip here. A misplaced elbow there. The stumbling art student who tore a Picasso tapped into the worst fears of clumsy grown-ups and every well intentioned parent who dares venture into big-people museums with small children. Signs demanding DO NOT TOUCH don’t mean much when accidents happen, especially when the culprits aren’t old enough to read but are small enough and antsy enough to dash through barriers. The Moment for Julee Morrison of Taylorsville, Utah, came at Elvis Presley’s Graceland, a huge attraction in Memphis, Tenn., with more than 600,000 visitors a year. All she wanted to do was feed her then 4-year-old son’s