Unfortunately I don't think that would be too effective for most kids.
Kids react to reality. Show them the hospital video of John Graziano.
FYI he's the kid who was riding with Nick Bollea (Hogan) during their high-speed fun crash. He's a vegetable, with a dashboard-shaped dvot in his head.
I didn't embed because if you don't want to watch it, you don't need to see the preview pic, either. It's pretty tough, IMO.
http://www.youtube.com/watch?v=05ip4jAA1PQ