I am really beginning to believe that the Watchtower can make these pronouncements at every assembly knowing full well that most of the audience is napping, reading their emails, taking their kids to the bathroom, and hoping to get home in time to see Game of Thrones or Ray Donovan. Yes, they do awake and take notice when its time to "sing" along with the recorded song that no one can really understand or stay in tun with and then get into position for the quick exit as soon as the final prayer is mumbled and bumbled. No biggie - Jehovah heard that very same prayer a week ago at several other cities and will hear it again several more times that very day.
All in praise to Jehovah.. Sure He really appreciates the attention...
JV