One of our two cats is a very energetic little thing, and very particular about what she does and doesn’t like. What she doesn’t like is having you move something while she’s on it, and she’ll bite you if you do. Not enough to do damage, but she bites, then licks the spot she bit in what I assume is a cat apology. She also comes into my dad’s office to lay on his mousepad or his /arm/ every time he leaves the door open. We love her, but she’s a pest.