Jehovah's Witnesses have always (at least since the 1950s) simply stood up or stayed seated and bowed their heads and closed their eyes (except those who are peeking around looking to see who just farted). Usually at the end a few will say "amen" after the old guy with the accent who just said the prayer for the past 10 minutes finally shuts up.
The question is this: How many times a night do you have to hear elders thank Jehovah for all the blessings when no one has been particularly blessed, for all the wonderful new information when they have just heard the same crap over and over again, and for blessing and protection for the governing body when they've got it pretty good already?
And Memorials... Does the Bible really require a prayer before the meeting, after the meeting, over the crackers and over the wine? Is that really necessary? And do they really have to pass it down every row each time when the attendants can see that no one in that row partook of the first choice? The whole thing is a farce, and yet every year every Jehovah's Witness, even the faders and the barely hangers-on feel like they have to go and sit through the show that is no show.