I was watching some of the Bob Newhart shows that came out on DVD recently, and they use a lot of Bob's famous "one-sided" phone conversations where the audience fills in the info on the unheard part of the conversations.
Jack used these to great effect - I think it's part of why the Benny show holds up so well, you need to think a bit, imagine, and fill in a lot of the gags with your own brainpower.
What are your favorite one-sided phone conversations from the Benny show?
Here's a current favorite of mine. Mary's on the phone with Babe, we only hear Mary.
Mary: Babe, what's that? You don't want to come to the show because you're mad at Phil Harris? Oh, no, that's ridiculous. I don't think he's referring to you when he sings about "The Thing". What's that? Your picture's on the music?!