I was coming out of the grocery store one Saturday right after I got the car and a mid-40s looking guy was looking at it. When I opened the door he commented that it was a nice car and asked what I did that I could drive a Porsche to get groceries. I said "I married a doctor".
I love using that line.
Too bad my wife didn't actually buy the car, she's going to be paying off school for the rest of her life from what I can tell.