Disclaimer: this isn't nearly as good as the Crysis "Raining Men" video, or most of the other "spawn a bunch of objects, it'll be funny" CryEngine 2 videos, for that matter. However, it is certainly worth watching anyway.
Before I get further ahead of myself, let me explain what it is I'm referring to. A dedicated Unreal Tournament 2004 player filled maps with many, many barrels, set the resulting massive explosions to the 1812 Overture, and created a video of the madness for our viewing pleasure.
Impatient readers will want to skip ahead, because the video spends a good time building up the suspense. Of course, that's part of the magic.
[Via Rock, Paper, Shotgun -- thanks, unangbangkay]