"My 4-year-old got into the 'Why?' phase a little while back. I read an article that said the best way to get them to stop was to ask them, 'I'm not sure, what do you think?' It is a godsend. They answer their own question, you provide some feedback, and they immediately move on. [Freaking] awesome."
He said when his wife is talking to someone. Her conversation. Not as in the husband is looking to his wife for answers or approval.