One of my students drew this picture for me the other day:
it's hard to see, but in the top panel, I'm lecturing (frizzy hair and all!), and the first row kid is paying attention (it says "thinking out loud"), the 2nd is pretending to pay attention but is really hiding his cell phone to text away ("click click click") and the 3rd is just out like a light.
The 2nd panel shows my fury... heh. I love it. Especially the dust.