Steno Presentation to Second Graders

My kid's second grade class is reading the excellent graphic memoir El Deafo, about the experiences of a kid who lost much of her hearing at age 4 (i.e., postlingually) from meningitis. Since people of that general description make up a large part of my captioning clientele, I'm going to talk to the kids about hearing loss, realtime captioning, the ADA, and accessibility work in general, but I'd also like to give them a rundown of steno and how it works. I'll be bringing in my professional machine and a number of hobbyist machines for them to play with, I'll give a live demo, and I'll also probably print out some steno keyboard diagrams for each of them to take home. Can anyone think of anything else that might be fun to do with a bunch of 7 and 8-year-olds during an hourlong presentation? Suggestions extremely welcome!