Thinking back, quite a few odd/crazy times. Literally, dozens.
We had quite a few anointed in our congregation (like 6 or 7) from Eastern Europe / Russia when I was growing up. At the time, being one of the anointed put you into a special class, even if you did nothing else in the congregation.
I remember one night, a brother from Poland (?), was giving what I think was talk #5. I think it was about 6 minutes or so until they "range the bell" when you went overtime. If you kept talking too long, they would ring it again.
Anyway, they rang the bell on him 2 or 3 times. He pointed at the brother with the bell, gave him an evil look, and said something like, in broken English, "Do you know what I am going to do what that bell if it makes noise again?"
Everyone was quiet and he went on for another 2 or 3 minutes.
That was one time when instead of giving council immediately after the talk, the School Servant simply said something like "Our school is running a bit late so we will give private council to Brother 'Nutski' afterwards. Now, let's all stand for song number ........... "
If he was working on "Timing" on his speech council slip, maybe he would have received a "W" (Work on This).