Steve Martin was wrong
When he was scheduled to host the Academy Awards, Steve Martin pitched an idea to Carson where Martin would state during the ceremony that the show was going so well, he felt like the best host ever, at which point Billy Crystal would come out. They would joke for a couple moments where Crystal would say he was the best host ever, whereupon Carson would walk out on stage.
Carson declined because he thought it would be just an attention-getting stunt. But it shouldn't have ended there. I think Bob Hope was still alive and still moving under his own power. It would have been one of the greatest moments in Academy Award history for Hope to come out after Carson and stand on stage along with Martin and Crystal. Definitely a chance for a great moment lost.