Does anyone remember how one of the two joystick ports in the C64 was polled before the other? In other words (although I don't remember if it was that way round) if you had joystick 1 then the person with joystick 2 would always be polled just that fraction of a second later, so in any game which involved both players pushing and holding the joystick down to do something, the person playing with the first-polled port would win!