No, DD3 isn't mad when she knocks stuff down -- she does most of her destruction with a smile. And she's careful with her baby sister. Somehow I think she knows the fine line between what she CAN knock down or destroy and what needs to be handled with care. Granted, her attempts to play peek-a-boo with her baby sister usually involve a burp cloth being forced on top of the baby's face in a not-so-gentle manner, but DD3 doesn't mean harm.
Maybe it's like our love of tearing down dry wall when renovating or smashing up an old concrete patio with a sledge hammer. Except they just knock down blocks and snowmen.
