if you're careful and have access to a pond with no fish in it, you can make a great sodium missile. Get a coffee can sized chunk of pure sodium. WEAR GLOVES. Do NOT do this on a humid day! Do not allow ANY moisture to get on the sodium AT ALL until you're ready.
It's best to store it in a rubbermaid container until you get to the pond.
Just toss the chunk into the middle of the pond. Make sure that's far away from where you are. About 2 seconds after it goes in, it'll explode out with a HUGE bang, and go straight up. It'll drop back down and explode out again many times. Fun stuff!
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