aawww!!! i wanted to tell him about thermite! u beat me to it, sounds awesomes. o hey, idk about airsoft, but put like a crapload of strike-anywhere match stick heads into one of those tiny water bottles. if u throw it hard enough...
KABOOM!!!
-i think, never actually done it but sounds like it would work. for skeptics, matchstick heads in mass amounts can be VERY explosive, just youtube it :P