This is a "water bottle grenade" Seamus and I made. To make this you need baking soda(not powder), kleenex, a water bottle filled halfway with vinegar, and the bottle cap. This is harmless(but loud and wet) as long as you stand at least three feet away from the bottle. Don't hold it too long after you shake it or it might cut your hand, which is why I wore the glove. Make sure there are no holes in either the bottle so it blows up right or the kleenex so the baking soda doesn't mix too soon. First off pour vinegar into the bottle, then put aside. Next put baking soda on a piece of kleenex, make sure there is a split between the baking soda, so you can fold it halfway, flatten each pile of baking soda, so you can put it in the bottle easier. Afterwards roll it up, then fold it down the middle once. Then insert the kleenex with baking soda into the water bottle of vinegar(twisting it into the bottle is the easiest way), quickly put the cap on, shake it up and down a few times quickly(I'd say 5 times), throw it high or far, just so it doesn't land close to you, and it should go off. If it doesn't, but you can see white foam in the bottle, either wait a few minutes, or kick it hard. I did this bottle wrong and it exploded after a while, but normally it should explode when it hits the ground. Special thanks to Seamus, who filmed all of this besides the last scene, where you can see him doing thumbs up.