redantstyle
Blue Belt
We do have a serious problem in our dojo of lower rank individuals trying to teach their training partners instead of training. We usually have to walk up to them and say "train! don't teach!" No one likes being taught by someone who knows less than he.
now THAT really aggravates me, and is far more common than impromptu 'testing' of the instructor.
off topic, really, but an excellent point.