Used to use pool acid and foil in a 2 liter soda bottle. Poor the acid in the bottle, pop a crumpled rod of foil in, seal the bottle, walk away. The foil takes

Used to use pool acid and foil in a 2 liter soda bottle. Poor the acid in the bottle, pop a crumpled rod of foil in, seal the bottle, walk away. The foil takes a few seconds to start reacting so you have time to seal the bottle. It gets hot so the bottle starts expanding and finally pops. One time the bottle expanded but didn't pop so after waiting for a minute or two I walked up. As soon as I touched the cap it popup off and covered me with acid. I ran to the closest house and used the hose to pour water all over me. I'm guessing either because it was spent from reacting with the foil or because it's made for pools and not all that strong that I didn't get any burns. That was the last time i did it.