Her mischievous side

Lately, Hannah has taken to laughing either when, or just after, she's done something "bad". Just now she tipped over a stool by our front door. When I asked her what she did, she looked at me laughed. She's also started doing this in the car. Out of nowhere, she'll suddenly start to laugh. When we get her out of the car, we find that she's take her mittens off. I think we might have a little stinker on our hands.