Maybe I'm exagerating some, my aunt's monkey wasn't horribly mean, really it was only one incident. But I was little and it kind of stuck in my mind.

Every time my mom would go to my aunts house, she would bring the monkey (Cole was his name by the way) a piece of fruit. She left one morning and didn't bring fruit with her because she was out. Cole went up to my mom, looked in her hands for the fruit, and when he saw she did not bring him any, he bit her on the back of her hand.