Yes, I had an incident with my Spanish professor. I turned in an essay that she said was too good to be mine. I was honest with her; I told her that I had a native speaker review the essay, but he made very few corrections. However, I had broken the Golden Rule of Spanish Composition -- the essay must not even touch the hands of a native speaker. To prove to her that I was capable of producing an essay that exceeded her expectations of a non-native speaker, I offered to re-write another essay in her office. I earned an A-minus.