"That's A (Not) Good Question"

You're interviewing someone famous and after you ask them something they respond "that's a good question."

Translation:  "I have had media training and thank you for asking one of the questions they prepped me for and this is what they recommended that I say to every interviewer who asks them.  I appreciate your asking it because now I don't have to think or get off my prepared script of the things I want to get into every interview I do."

Advice:  If you can't come up with fresh questions that make your subject have fun, think and get off of their prepared verbiage, at the very least pre-record your interviews off air before you run them and edit out the canned phrases like "that's a good question."

The interview isn't being done to make you feel better about yourself. 

It's supposed to entertain and engage your listener.