Sodium Party
Okay, here's the now extremely popular website of a man who got ahold of three and half pounds of solid sodium metal, and decided to toss it into some water just for the joy of watchn' stuff go boom, for science. That's "science" in the Andrew WK sense of the word.
"I'd read about, and heard stories about, throwing sodium into water. It's a classic thing chemistry students do in college, and based on the reports I have been able to find on the internet, they are often drunk at the time...I decided I should produce a comprehensive online reference on sodium dropping, with documentation on the size and shape of the chunks, how thrown, and most importantly with videos of the resulting explosions. To do this, I held a Sodium Party. People brought chips and soda and we had a cookout."