Susan May Pratt played sousaphone in her high-school marching band but left home to pursue a career in modeling and eventually acting, where she made beautiful music with men’s instruments. The waiflike brunette has beauty to spare yet has not shared. She made pupils pop in The Substitute 2: School’s Out (1998), and in Open Water 2: Adrift (2006) she looks good in a wet thong. But if Susan gets naked, then Mr. Skin will be happy . . . in my pants.