WATCH: Conan O'Brien and David Letterman Rip Jay Leno [VIDEO]

Conan O'Brien and David Letterman

Conan O'Brien, David Letterman Diss Leno

Check out Conan O'Brien on David Letterman last night -- marking O'Brien's first visit to the Late Show in 13 years.

You didn't think they could get through the interview without chatting about Jay Leno though, did you?

Given O'Brien and Letterman's history with Leno, it appeared the two had plenty to dish about.

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O'Brien's entrance included a moment of awkward silence between the two before Letterman noted, "I think the longer we just sit here, the more uncomfortable it will make Jay."

And so it began ...

O'Brien added, "You know Jay's watching right now. You know he's ... he's getting a live feed in a satellite truck right now. He's watching every second ..."

Letterman commented on O'Brien losing his job as host of The Tonight Show in 2010, saying, "I was delighted by everything that happened, except you losing your job."

No doubt O'Brien could understand Letterman's glee over the situation, but at least Dave was sympathetic to Conan being out of a job.

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Letterman went on to call the dust-up at NBC over The Tonight Show "The Golden Age of Television," to which O'Brien laughed and said, "The period when I lost The Tonight Show, that brief week and a half period, for you, is the golden age of broadcasting?"

Letterman and O'Brien really ought to get together more and trash talk (and do their Leno impersonations) -- great interview!