I fly the 135/145 series and have always noticed that the airplane is very stable down the runway. The only explanation I can come up with would be a good crosswind in which the tail gets pushed away from the wind turning the nose into the wind. If you over correct you will end up going down the runway in a zigzag fashion. That or some really touchy nosewheel steering.
Actually flown: EMB-120 EMB-145 B717 B737 B757 B767