I received a chain letter warning of the danger of kids inhaling Dust Off (I've got a can in my workshop--great stuff for cleaning up computer innards, crashed engines, and the like).
Snopes says that it is true that "Adolescents huffing from cans of Dust-Off brand compressed air have died."
I never would have guessed that compressed air could be dangerous to kids. If you've got Dust Off or its equivalent in your shop and have some kids who might get at it, you might want to follow the link above. It was an eye-opener for me.
Marty