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What set off this jaw-dropping moment? (CBS)

American television has late night chat programs on practically every network channel, five days a week, until the wee hours, but it just feels a little bit more special when one of our Favorites pops up.

David Tennant, whom we know and adore, swung by The Late Show for a catch up with the “other” David, as in David Letterman.

The thing is, we preface Tennant’s visit by saying we know him because Letterman was quite intrigued by how the rest of the world got acquainted with the Scottish actor, asking Tennant, “For God’s sake, what do people know you from?”

Umm, was that a rhetorical question? Letterman goes on saying, “They know you. Do they say ‘You’re the guy from Gracepoint.’ Or Church Town [sic]? Or Doctor Who?”

Of course, Whovians know the correct answer, but watch as Tennant gives Letterman a “Doctor Who 101” in the below video:

It’s not a contest, but which David had the best zingers?

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By Brigid Brown