Last night ... about 5:30 ... heading West on the Mass Pike in Millbury ... 70mph in "bumper to bumper" rush hour traffic. A pathetic "F", one who clearly has no sense of self worth other than that achieved through aggressive driving, jams himself into the left lane, actually causing me to hit the brakes to avoid hitting him. I lay on my horn to express my displeasure, and the "F" slams on his brakes, forcing me to swerve into the shoulder to again avoid hitting him. Then of course I witness his exaggerated arm-flailing, similar to that made by an ape when it's disturbed in its cage, as if to indicate that he's somehow won a contest by endangering another motorist.