I think that this is just part of intelligent 'testing' of the environment that a bright kid finds itself in. My DD was a true and literal terror at that age. I used to think 'God - please let her be precocious so that this is the "terrible twos"' - it wasn't; she got worse, a lot worse before she got better.
I still remember one time that DW told her to do something and DD (3 at the time) immediately started arguing about it. When DW tried to stop this DD replied 'But if you don't teach me to argue Mummy then who will?'. DW and I still chuckle about it now but it was hard to keep a straight face at the time.
By 4 she had learned to 'deal' and is now a sweet child for the most part (now 8).
Last edited by madeinuk; 05/09/13 11:19 AM.