Cats - otherwise known as little fluffballs of mischief. They can be the most affectionate, cuddly, wholesome little beings right up until something very valuable is standing on the edge of your shelf, then... really, it's your fault for leaving it there. That vase was totally fair game for the cat.
No cat embodies this spirit of mischief better than tumblr user's, sandersstudies, cat. This awwwwdorable little furball just keeps causing problems. From incriminating sandersstudies's husband to not letting them sleep at night, the shenanigans never end. Of course, the cat also knows she can get away with anything if she just makes that face at them.