I've had a driver repeatedly over take me at speed, pull in to the curb, brake sharply, presumably to make me ride straight into him... or possibly because he had to slow down and make way for me as I avoided a curbside grid in order to get his own back (no concept of primary or secondary at the time so always rode in the gutter).... any how, when he was stopped at the light I was furious as he'd pulled the same stunt four or five times within say 30 seconds... we exchanged obscenities at the light through his closed driver window, but what I should have done was got of my bike, picked it up, smashed his back window with it and shouted "Is that what you want?" ... an over reaction maybe, but far more satisfying than just hurling abuse.