Don't bite more than you can chew.

He leaned down until his lips brushed her ear. “I told you to stop flinching.” And then he bit her. A slow, painless nip but there were definitely teeth involved.

It never rains, but it pours

People who live in glass houses shouldn't throw stones

No matter how bad a child is, he is still good for a tax deduction.

Little pitchers have big ears