"In college we made bombs out of plasic bottles and liquid nitrogen..."
this reminds me of the time i put chunks of dry ice in a sprite bottle, poured boiling water inside, closed the cap tight and took off running. ran about 50 yards, stopped and didn't hear anything.. so we waited around for 10-15 minutes. listening, waiting, chatting, when a security truck pulled up (this was at night in after-hours parking lot). guard was going home but gave us a big lecture about no loitering and junk. he let us go and drives away. not 10 seconds later, the bottle explodes like a cherry bomb.. ran like hell after that, imagining how busted we were if the guard spoke a few extra sentences! -g