This prop would go long if with in 1 year of Pres Bush's anouncing that loans would be made available to them, 1 or more of the big three go bankrupt.
The ending date would have it ending 2weeks befor the year end, mabey sooner if goes short. It should also be easy verify and could mabey pay out soon enought to use in next years end of the year firesale.
Needs refer links pro and con.

140 years of Popular Science at your fingertips.
Each issue has been completely reimagined for your iPad. See our amazing new vision for magazines that goes far beyond the printed page
Stay up to date on the latest news of the future of science and technology from your iPhone or Android phone with full articles, images and offline viewing
Featuring every article from the magazine and website, plus links from around the Web. Also see our PopSci DIY feed
The 6th annual Invention Awards are here, from an inflatable tourniquet to a better lobster trap to spring-loaded hocket skates. This issue is all about the celebration of invention.
Plus: Making synthetic biology breakthroughs in a garage, building a constantly-moving ping-pong table, and a ridiculously overpowered barbecue.
from alpha, il
bump
Could almost be too easy :)
However what could complicate matters is defining 'bankrupt' if some sort of non-standard banruptcy is created for the carmakers.
How about making it "Go out of business" and making it a longer term - say 2 or 3 years
What if one car company gets absorbed, by another car company?
Would that qualify as going out of business?