I clearly recall this one senile brother who was always asked to give prayers from the platform. He'd usually end up thanking Jehovah for our sins.
One other time, our bookstudy conductor overseer did some research on some kind of food mentioned in the bible. He made printouts and handed them out to everybody. One sister read it before we started and bursted out in laughter. In print, the phrase "tastes like crap" was clearly written (it was supposed to say "crab" instead of "crap". She pointed it out to the conductor overseer, and the entire house filled with laughter.