The smartest thing my cat has ever done was figure out how to open the cabinet where we store her treats. One day I came home to find the cabinet ajar and treat crumbs scattered about. After catching her red-pawed in the act a few times, I realized she had mastered pulling on the cabinet knob until the door popped open. It was both impressive ingenuity and maddening behavior! I had to get a child proof latch to outsmart her insistent treat cravings.