The big-chinned legend of late-night \u2014 who hosted 'The Tonight Show' for 23 years \u2014 opens up about his unlikely ascent from vagrant to Johnny Carson's successor, the truth about his friendships-turned-feuds with Dave and Conan and why he now hosts a show about cars for CNBC.\n\nCredits:\nHosted by Scott Feinberg\nProduced and Recorded by Matthew Whitehurst\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices