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Magnesium in water is not as cool as lithium, sodium or potassium, the chemical reaction between usually drain-o, and aluminum foil is a very fast release of hydrogen, so yeah you can encapsulate the reaction and cause the pressure to pop the container, but the better, and funner mischief is to harness the hydrogen being produced and use it to cause a real explosion. or you can always use hydrogen to power a internal combustion engine, and there are easier ways of harnessing it besides drain-o and aluminum foil, example water and lithium, or sodium, or potassium, the laters reactions are so fast though that they produce heat and cause explosions during the reaction. its pretty cool to throw some potassium in water, because the water becomes the fuel and theres really no way to put it out