The best work my students have produced since before midterm break is the following metaphor:
"Bhutanese students are like ema-datse because they make foreigners sick."
I have realized I am very susceptible to tangents in class, because I am usually willing to indulge the one or two students who are in any way curious about anything. In the last three weeks I have tried to explain the Singularity, the sociological differences between Judaism and Christianity, and tautological arguments to kids who took two classes to understand haikus. Last period I spent five minutes explaining why jet-propelled aircraft cannot hover. I have some improving to do, teaching-wise.