Last night on the Late Show, Conan O’Brien and David Letterman, both of whom, on separate occasions, NBC had passed up for Jay Leno on the Tonight Show, took turns ripping on their late-night rival. The more trigger-friendly of the two, Letterman noted from the get-go, “The longer we sit here, the more uncomfortable it’ll make Jay.” Surely enough, any discomfort that Leno may have had lasted through the whole interview. Letterman called him a “brat” and a good Samaritan with even better PR. And Conan, during his first visit to the set in thirteen years, dug at Leno’s antique car collection. In their final act, they tag-teamed over Leno’s high-pitched talk — “You’re not doing the head wag!” instructed Conan. Meanwhile, on the Tonight Show, an NBC executive, straight off of upfront week, presented a spoof reality show called Life with Busey. Plus: Matthew Morrison recalled his first vagina sighting; and Arsenio Hall used to make Paula Abdul, his ex-girlfriend, laugh till she peed. Watch our compilation to see what you missed.