Cats

Cats do what they want, when they want
They rarely listen to you
They're totally unpredictable
They whine when they are not happy
When you want to play they want to be alone
When you want to be alone, they want to play
They expect you to cater to their every whim
They're moody
They leave hair everywhere
They drive you nuts

Conclusion: They're like little, tiny women in cheap fur coats.