So Long and Thanks For All The Fish was my first instinct. My mother always told me to trust my instincts 'cause I have good ones

Well, your mother is dead right, Connie!
Received word from On High , and the lorry driver's name is Rob McKenna.

Here's a relevant (if slightly strange) link:
http://www.geocities.com/Yosemite/Trails/9846/strange/rainmake.html

I'm still sure there is a term for an unwitting sower of social discord. Maybe I dreamt it.