Two minutes before scheduled takeoff and there's a kerfuffle in economy. Someone is not happy with his seat and is letting the cabin crew know about it in no uncertain terms. Angry voices waft over the boarding music. Maybe someone wanted to sit next to a traveling companion.
There's nothing wrong with teaching with enthusiasm. And yet if we concentrate so narrowly upon satisfying the consumer demands of the educational market, we replace scholarly rigor and standards of excellence with grade inflation and an acceptable mediocrity.