LOL at garybuss - those photos are classic - boy do they bring back memories!
I used to spend most of the time doodling and that kind of thing to avoid falling asleep and then of course there was the prerequisite take a looooong walk to the loo break - this could take up a whole talk if you did it right and bumped into enough people. One of the last CA's I recall attending I sat with the crowd of bad association that I was hangiing out with at the time - we were whispering and passing notes and generally being quite disruptive I guess, we were actually called out about it... quite immature behaviour I admit, but it was the most fun assembly I remember going to!