Almost had a Darwin Award winner from the young guys in my troop due to 0000 steel wool... they had their Klondike Derby sled packed with everything for the day, and one of the events is fire starting. Among other things, they had steel wool, fatwood, and, yeah, you guessed it, a 9V battery in close proximity in the sled... at some point, while dragging the sled around camp, they hit a bump that must have shifted some things around, and the battery and steel wool, which were supposed to be in separate containers, were now in contact... fortunately, this firebuilding kit was all in an old #10 can, which contained the flames before they spread to the wooden sled filled with wool blankets spare clothing, etc. Fun Fun Fun!