The two year old...

What is it about a two year old that makes you feel like you are living with a mentally ill person?!  I swear one minute he's happy and full of kisses and then next minute I turned the doorknob the wrong way and he's melted down onto the floor.  I try to reason with him....nope it only turns into a battle.  I yell and he escalates even further.  I swear there are moments when I wonder what happened to my sweet little boy.  He must do everything himself, at the exact moment he wants to do it and the exact way he wants to do it.  If those things do not occur it is a battle!  The scary part is that I sometimes find myself tiptoeing around his craziness!!!  The even scarier part?  I have to repeat this in two years...with two two year olds :).