LOL Simon
One of the Kingdom Halls I attended with my wife, some few years ago, was so small that it didn't need or have a PA system. I don't know if it was because of this, or if it was simply before JW's instituted some unwritten rule requiring prayers to be given from the podium, but at any rate, the one offering the final prayer would simply stand up from his chair to pray.
One night an elderly fellow was called upon to give the final prayer. But when the song concluded another eqaully elderly gentleman with a similar last name (VanHorn & Vanderwall were their names) also stood up. One had been sitting clear at the back and the other had been sitting in the 2nd or 3rd row. Apparently, they were both somewhat hard of hearing because they gave their prayers at once, completely oblivious to each other
Although this would have been embarassing rather than funny, (I've got a soft streak and can't stand to see old people embarassed like that) their prayers were so scripted that they were virtually identical. They prayed for the same things in the same order and said "Amen" almost in unison.