Starting sentence with OF Of all the levels I have mastered while gaming, this one is the most exciting. Of all the things I have ever seen, the Grand Canyon is the most amazing! Of all the people on Yahoo Answers, Mr. Sonny is the nicest. Of many computer stores in this city, Cricket is the best one. You are of your father the devil. ( Of your father the devil ) You are the devil of your father. He is the security of your school. ( He is of your school the security. ) Of your school the security, I have never seen yet.