Put an entire cup of alkaseltzer inside an empty metal tin can.
Next, put water in a plastic cup, and place the cup inside the can WITHOUT dropping a single drop of water (this is very important).
Smear superglue on the can lid and let it stay for ten minutes. After that, as soon you tip the can over, the water will enter in contact with the alkaseltzer and the pressure will make the can blow - it is powerfull enough to make a hole in the wall, so stay clear.
Okay Yea Forums
Thomas White
Juan Price
baking soda and water make balloon go pop
Colton Smith
Go to your local fireworks shop and buy a entire crate of the biggest bombs they have.
Douse it on gasoline and make a fuse with a long rope doused in gasoline too.
Lit and run.