Lot's of off the wall responses in this thread. If you are riding and paying attention who has access to a handful pennies, nuts, bolts, nails and other sundry stuff to toss at the following driver, or be able to reach in and pull out a weapon (made in jest, who knows)? The truth of the matter is you don't have a lot of options to keep a tailgater off your ass other than to flash your tail lights or to maneuver and get out of the way on your own. Showing road rage is always dicey, on a m/c it is looking for trouble which you will usually come out on the short end of the stick. Responding to bad behavior with more bad behavior just gives more ammunition to those that want to marginalize or get rid of m/c's on the road.