On our trip down to Florida, we listened to the audiobook of Bob Newhart's memoir I Shouldn't Even Be Doing This, And Other Things that Strike Me as Funny. Newhart was very generous in his praise for Jack Benny, "the best comedian of all time." He says that in part his comic persona drew from Benny's--Newhart's use of the phone as "partner" in his act meant he had long pauses built in, and he studied Jack to see how a master incorporates silence into a comedy scene. Benny also helped Newhart along early in Bob's standup career; once he laughed so hard at a Newhart sketch ("Submarine Commander") that after the show Benny asked as a personal favor that Bob always tell that story whenever he knew that Jack was in the audience.
So years later Newhart saw Jack come in to one of his shows and did a twelve-minute version of the sixteen-minute sketch. Afterward, Jack came backstage. "Did--did you like that I performed the--you know, the submarine sketch?" Bob asked.
Jack erupted in mock irritation: "But you left out the best lines!"
And he proceeded to do the entire missing four minutes from memory!