This is something that happened back in Russia in the 00s. It was a teacher who just couldn't seem to get along with his students, this big Canadian doofus who had formerly been an emergency medical services guy.
I heard this from next door,
Shortly after that, they all walked out of class and demanded a new teacher.
I think he only lasted about 6 months at our branch, though he struggled through some other jobs at different branches in Russia for a while, too.
I think the moral is just be aware that seemingly innocent and harmless things can end in disaster quite often in TEFL.