I am seeing a pattern with the girls emerge. My girls get feisty EARLY. I remember Maya throwing a full on tantrum at 18 months because I made her get out of the bathtub. Now she is very sweet and almost never throws them.
Recently, Zoe has become quite the little drama queen. If you take something away from her (or tell her no!) she will start crying and lay herself down on the floor on her back and wail. It ends up looking like this: