Sodium explosion videos
When you drop a chunk of sodium in water, it will explode. This guy has posted videos of his "experiments" with large chunks of the unstable metal.The first step was the procurement, through eBay, of three and half pounds of solid sodium metal for about a hundred dollars. This is a decent price for a small quantity like this. Small being a relative term: It's used by the ton in industry, but anything more than a few grams is a dangerous quantity if found in your home. Three and a half pounds is enough, for example, to blow your home to bits under the right conditions.
Link (Thanks, Chris!)
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Mark Frauenfelder
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