Monsters?

The top picture is Kaitlyn, and the bottom picture is Grace, the question is how does something so sweet, so small, and so innocent turn into little monsters that you have to discipline so quickly? Just when you think that you have them trained to behave well they turn on you and act completely horrendous and you wonder what ever happened.

Okay, so they don't exactly look like monsters and I guess that they really don't act like them but they do know how to push my buttons.