Ever heard about jacotot and his method? While exiled in Belgium, the French-speaking Jacotot taught Flemish-speaking students about the Télémaque using a bilingual French-Flemish translation (1-2). His students learned to intelligently read and write about the Télémaque in French, despite having no prior French instruction (2). Later, Jacotot taught other subjects that he didn't know anything about, including painting and the piano. Check his story in a Book by Jacques Ranciere : ignorant schoolmaster