"A Little Casual Touch"

(AP)

At one point, Colbert noted that Couric added "a little casual touch at the top of the news – you say 'hi, everybody.'"

Responded Couric: "Well, now it's a little formal. It's 'hello, everyone.'"

She then went on to explain why she leads the show with those words.

"Well, you know, I thought about it, and I thought, really, the only people who say 'good evening' are doormen and maitre d's…I found it just to be a little pretentious and portentous," she said. "So I thought something more relaxed and casual would be a little more accessible."