Bah - if you want REAL fun and danger, do what I did: I pedaled my bike around the neighborhood and got local gas stations and mechanic shops to give me those little lead things you use to balance wheels with. Melt 'em on the stove in a soup ladle, pour the lead into these molds, and you've got creepy, crawly lead paperweights to sell at school! (OK, so my fourth-grade sense of capitalism *was* highly developed... what of it?)