MobMov is a website with advice on how to create guerrilla drive-in movies.
The concept is relatively simple: Use an HD LCD projector, plug it into your car, grab a DVD, find a large wall and make a drive in event. Spread the word via a flash mob and let the party begin.
I have big admiration for the dude that put his projector on a vintage BMW motorcycle sidecar. Self described as guerrilla drive ins, Santa Cruz, CA created the buzz. MobMov.org has set up a website to help with advice on how to bring the drive in into your neighborhood.