Sometimes I want to do this in class, too, when kids think that answering a phone and chatting is more important than a lecture, or that it’s okay to text-message during exams, and so on. Not that I would do this to a student’s phone, but I sure want to, sometimes.
(Usually, instead, I ask, “Is this a life-and-death emergency?” when the phone rings, or, with repeat offenders, I take the phone and speak into it in English, or, once, in somewhat-simple but all-the-same-comprehensible Korean words, I informed the person’s girlfriend that he was in class and unavailable to talk. And then, for three weeks, I start class by waiting till everyone takes out his or her phone and turns it on vibration mode.)
But the urge sometimes to do this does, one has to admit, exist.
UPDATE: Seems I’m not the only one to have noticed this video.