Conan O'Brien and David Letterman Mock Leno on 'Late Show' (Video)

Nothing like seeing a couple of old pals get together again after a prolonged absence ... and savage a common enemy.

Conan O'Brien made his first visit to "Late Show With David Letterman" since 1999, and naturally the conversation turned  to Leno, to whom both have lost out on the "Tonight Show" gig to Leno.

"You know Jay's watching right now. He's getting a live feed in a satellite truck right now. He is watching every second," Conan cracked, before launching into a wicked Leno impression.


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