the works bomb, im sure everyone knows..... toilet cleaner and aluminum foil balls?? oh wow.. at night you can see the explosion from a ways away..
dry ice bombs..... dry ice fragments.... lots of them... maybe a fourth of the way through... then fill the rest with water... top the bottle off so that the CO2 gas pressure builds up.... we used to throw those up into the air (in open fields near parks of course) and hope it didnt blow up on the way down... and of course... most did.... our timings werent on..
a crackhead once told me my freshman year how to make "magma".... you mixed cleaners and what not till it actually became kinda gooey... take a jet lighter and it'll ignite, but not violently, just glow... and there's really no way to put it out... until the fuel runs out, it burns through substances..even the sidewalk.... someone supposedly had it done to their car roof...