Just after college I held a job for a few months teaching French high schoolers how to speak English. I'd been told that they'd be fluent in English, it was my job to teach them subtle nuances of conversation in American English. Their English turned out to be worse than my French (non-existent), but I pushed ahead with my lesson plans. One of them involved me standing in front of the class and saying things in odd accents, and the kids trying to write them down. My favorite was, "Pahk tah caa en haa-vad yod." Only one student got it right. I told her she didn't have to worry about getting whatever the highest grade is that you can get in a French high school. Top of the class, that one.