>Personally, I like pyrotechnics, from firecrackers on up, and have done

Me too, does running beer cans through a tree limb chipper produce "rough 
granular aluminium"? Hmmm. Never should've dumped the '72 Rusty Westy. 
Would've made a great lawn ornament, once slagged down via a beer can 
induced thermite reaction. tim s.