Rule 1: Never flip off someone you don't know.

Learned this the hard way after flicking off a driver that cut me off on the freeway. He waited for a couple minutes in front of a semi for me to attempt to pass it... once I was along side the trailer, he slammed his brakes from about 75mph to 40 or so, nothing opens your eyes like skidding all four wheels trying not to go into the ditch to the left, hit the trailer to the right, the person trying to kill you in front, all while watching a truck from behind getting way too close for comfort

Rule 2: People in general hate bikes, even more so when getting passed in their cage.