In college we were asked to fill out reviews of our professors. I did one for my English professor and in the write in section I wrote, "He teaches English real Good." They were anonymous but the professor received copies of them. One day in class he broke it out and said do I even need to ask who wrote this as he walked across class to my desk and put his foot up on my desk and glared at me. The whole class was rolling as he read it.
