First off watch the following video of a Crysis physics engine demonstration, which is basicly a small test with 500 barrels filled with fuel and how they would react to gravity and/or bullets.

Pretty cool. Now imagine the same thing but add 2500 more barrels, whirlwinds and stackshaping, and you’ll get this:

I can only say that the computer running this little joke must cost OVER NINE-THOUSAAAAND!