|Azumanga Daioh is the master example of gag manga.|
I found a couple of good sources that helped me create an instructional Power Point and handouts for the teens:
Wikipedia (yeah, I know)
Then I found a four panel comic template on Deviant Art and printed out a bunch of sheets for the teens to draw on.
|From: Deviant Art|
First, I went over my short presentation to give them the basics of how to format their comic panels, then I let them free draw while we ate a snack and watched some anime.
Overall, this was a great, low-prep activity to do with the teens!