LOL... that sounds like a plan. I usually just smile or wave. Although here is another story where provocation can cause problems with road rage by aggravating the situation.

A prelim. to this one. The Roads and Traffic Authority, not sure of your state equievelant, ran an add campaign to try and curb Provisional drivers driving erratically after several cases of innocent bystanders being killed when they lost control. Quite an interesting tack to take and I think it had quite a good impact. to see the actaul add there is a youtube clip at the bottom of the story.

http://www.news.com.au/story/0,23599,22679374-2,00.html