In the early 80's a fanatic elder in my congo (who would later become a CO) had my father (an MS at the time) make several signs that read "Gum chewing not allowed" and "Talking not allowed" (in Spanish)... each sign also had a Bible text about "obedience" (can't remember which one right now)... Anyway, my father made some really nice-looking signs that I remember being very proud of at the time... This elder then had my father hang these signs in strategic locations throughout the KH on a Saturday after field circus...
The following Sunday, this elder (who was also the Watchtower Study conductor) stops the study after the first few paragraphs and says: "When sister (Gum-chewer) removes the gum from her mouth, we will move on to the next paragraph." As you can imagine, the KH went completely silent... I remember everyone becoming completely still with their eyes glued to their magazine for what seemed to be an eternity. Then he asked the reader to read the next paragraph and the study continued as is this elder's public humiliation of this sister never happened. But just before the last 2 paragraphs or so, he stops the WT study yet again and says: "When sister (Chatty) is done talkng to sister (Nosey), we'll continue to the next paragraph." Again, the entire congo cringed...
I'm not sure what happened afterwards as I dared no look in that direction. But this was the subject of many a conversation for many weeks afterwards and the two sisters who were publicly humiliated never returned to the KH (at least not ours)...
(I could tell you other stories about this elder but I'd be seriously derailing this thread...)
That being said, I seriously doubt that this has been seen anywhere else in any other congo... this is probably as extreme as it can possibly get with a fanatic elder...