When celebrities are married to other celebrities, it's become a common courtesy to ask about their famous other half during interviews. But the courtesy gets a little murky when dealing with unhealthy marriages as we saw with David Arquette on 'Late Show' (Weeknights, 11:35PM ET on CBS).

Luckily, Arquette appeared to develop the giggles through the course of the interview, so there was no chance he was made uncomfortable by the question. We did love his response to David Letterman's initial question asking how Courteney Cox was.

"Courteney's fantastic," he said, and then after a pause. "We're still separated."

It was like he was explaining this to his elderly grandparents who might forget things like that from time to time.

He went on to explain that despite the love he has for them, the pair have proved to have incompatible personalities. "We grew apart and I advise everyone not to let that happen," he said during a short burst of seriousness.

Then it was off to the giggles again as he talked about how Cox is calm and he's wild and crazy and how she thinks he's moody and how he says, "I'm not moody, Dave!"