Hi Jaime.
I have some ideas - of what not to do.
I give demos each year to hundreds of third graders as part of some sort of educational "farm experience" the schools set up here.
Don't ask.
For a while I used the good ole "Go ahead, kids. Try to pen the sheep." ploy. Naturally, the knee-knocking, brain dead sheep I use for the demos make the kids look like idiots. And then I take these overly dog-broke farm sheep and put them in the pen in 10 seconds with my open dog, who never even really has to try. The sheep see the dog and they know it's pen time. Works every time. Lots of applause. One year I even made the kids' teachers do it. The kids loved laughing at them. As did I.
But.
One year I somehow picked some very aggressive little third graders to try the pen. They spooked the sheep so badly the sheep squeezed through the horse panels.
Demo over.
I spent hours chasing the sheep through the fairgrounds (which contain the horse arena). Naturally, many other little demos were going on throughout the fairground. (This is a cow. This is a steak, etc.) I was quite the spectacular side show as I would chase a single through the "Corn: a many-faceted resource" demo, knocking over stuff, whistling like an idiot, etc.
Moral: Don't involve the little bastards in your demo.
charlie