I can't invoice my husband

So yeah, I've been sitting around here without a job for a while now and I am getting bored.

Mr. Sweetypants just popped into my playroom to ask a simple grammar question: What is the rule about "that" versus "which"?

I got so excited to be asked I grabbed the closest piece of paper, which happened to be the backside of a bill, and gleefully sketched out the Strunk and White example. (No, I will not be pursuing a career in illustration or calligraphy.)

Gah, I used to get paid for this.