The tailgaters really get to me.... I have been thinking about what kind of stuff could be sprayed behind me which would get their attention...

Carbon black mixed with Honey ? this would not wash off their windshield very fast.... but would not harm their car..... if it could be made to look like it BLEW out of the tailpipe that would be great.... I could claim bees built a nest and it just got dislodged at that moment....LOL