I'd prefer to go in a blaze of glory... but not really for something I believe in. Unless you consider humor something to believe in.
Here's the situation I want...
I want to become an alcoholic, and go into rehab for 666 days. When I'm released, stone sober, I want to be hit by a truck driven by a drunk driver (I've always loved irony). But that' not it... I want my corpse positioned in such a way that when pictures are taken for police files and newspapers or whatever, my lifeless body is right next to the "how's my driving?" sign.
There are a few other stipulations... such as, I want "**** Happens" engraved on my urn, and the Benny Hill theme played at my funeral/viewing, whatever, while people enter and leave (complete with funny sound effects, like *BOING!*).
How's THAT for a cause? haha ;)