This is clever and effective.

Having worked as an English Language teacher for years (in Japan and Canada), I understand that students need something to keep them interested – and more than that, to keep them from getting bored.

I remember often being bored when I was a student. But I also remember sometimes being interested. The difference was the teacher and the way the material was presented.

One way to keep students interested is humor. Once I, as a teacher, learned that, my teaching became much more effective.

After you make the class fun and interesting, you can teach the students anything, even those parts that might be considered "boring." That method works for the teacher, and it works for the student.

Keep teaching, and keep it fun and interesting!