Barbara Walters joined David Letterman on 'Late Show' (Weeknights, 11:30PM ET on CBS) to discuss her "10 Most Fascinating People of 2011." Letterman mused that he was surprised the Syrian president wasn't on the list, but Donald Trump was.

"Whatever you think of him, the man is fascinating," Walters said. "The day after someone else is elected, Donald Trump is still going to be saying that he's the candidate."

When she asked if he liked the Kardashians, another curious entry, Letterman stammered for a while and finally said, "I'm gonna do you a favor. I'm taking them off the list." Her segment with the Kardashians should be interesting, as Walters interviewed them back in September.