At 17, most kids pack up and leave home. Last night, after 17 years as host of The Tonight Show, Jay Leno heads off into the sunset—well, to a 10 o'clock time slot. But still, for 17 years, Leno has been sitting behind the legendary Tonight Show desk and bringing late-night comedy to America. From an appearance by the president to his bromance with Mel Gibson, here are some of his best moments.