I was lucky enough to be on Johnny Carson's show a couple of times in the eighties, hustling silly books. In fact, the first time I was ever on any TV show, it was the Tonight Show. It went pretty well, and when it was over I thought, "Wow, this is easy!"
At the time I didn't realize that the reason it seemed easy was that I was being interviewed by the absolute master humor interviewer, a guy with the generosity to make you, his guest, look good, and the skill to set you up perfectly, so you really couldn't help but get the laugh.
I was promoting a book about do-it-yourself home repair, and during the commercial break, Carson leaned over to me and said: "I used to try to do do-it-yourself projects. (Perfectly timed pause.) You can't do shit yourself."