I remember in the 60's the district overseer always gave the keynote talk at the district conventions..
in those days the sound radiated from the stage by ginormous Horn speakers and the sound traveled over the heads of the first twenty or so rows usually reserved for the elderly and got them after it bounced off the back wall the reverberations played heavily on the attention span.
Well those twenty or so rows soon ended up in the land of nod and after his talk the DO marched up to the sound department that happened to be at stage right and gave the sound department overseer a piece of his mind.
The sound department overseer promptly replied to him "well lets see if you can do any better" and went to his mighty 1KW sound system and pulled out the mains cord and input cords and promptly wheeled his amplifier out of the venue into his bus and went home.
I also remember when one of the bro,s had his ghetto blaster at a circuit assembly and he had his headphones on during the afternoon session one of his mates leaned over and pulled out his headphone plug and everyone enjoyed the rugby match being broadcasted.