It's that time of year again...

demolition derby
noun
A contest in which drivers crash old cars into each other until only one is left running.
As Answers.com notes, there is a "dwindling supply" of "traditionally used junked full-size American sedans, especially those from the 1960s and 70s, which were larger, heavier, and had more robust frames than later full-size vehicles."
So last night, there was a special class of vehicles: minivans. Yep, the suburban soccer Mom vehicle of choice.
(Personally, I'd like to watch a few gas-guzzling, pretentious-as-hell Hummers get trashed.)