Sarcasm is not only a foreign concept for most Japanese, it is too difficult for our students to even contemplate. As much as I'd love to, there's definitely
no dark sarcasm in the classroom.
A short string of students often don't show up for their scheduled lessons. I don't know about them, but I certainly need to continue with my own education (in Japanese language). I welcome the opportunity of a spare 40 minutes to learn another Kanji character from my recent book purchase
Finally, no matter how flirting (or frustrating) any student may be, of course there is that strict company rule: Hey, teacher, reave those kids arone!