The No. 1 reason you should've tuned in to the Late Show With David Letterman last night? It was a celebration—albeit a relatively understated one—of the CBS (and onetime NBC) institution's three decades of bookending the midnight hour.
As befits such a milestone, Letterman brought out one of his most popular and headline-grabbing guests: Howard Stern.
And he didn't disappoint, wasting no time in bringing up Dave's many feuds, starting with arch-rival Jay Leno. After offering up the requisite congratulations, of course.