Guy I worked with took a hand full of gunpowder and dropped it by the gap at the bottom of the bathroom door while his buddy was in there. He took a spraybomb of B-12 and made a 'fuse' to the charge, and WHOOOOMM!!! Made a whole bunch of smoke, and when the poor fella got up offa the can, and come out, smoke was coming out of his hair, his clothes, etc...
I'll never forget him coming thru the bathroom door, buckling his belt, smoke rolling out, saying "Ya sons a b!+c#&$!! Damn y'all's time! I declare!!!Ya sons a...."