This is a nice parody to introduce the question of importance of grammar and eloquence. Before Playing the video, you can ask your students to answer the questions from the worksheet and discuss.
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If they agree with you that good linguistic manners are important, they might be ready to go into more details about some of the things he mentions in the song, such as the right use of the apostrophe etc. If you teach teenagers, you probably know the importance of timing for these things. I managed to get them interested after this song for a long moment.