Two Old Pros

It's hard to top Jack Benny and Grouch Marx together.  Despite what the title on the video says, though, this is not from You Bet Your Life.  As can clearly be heard during the voiceover narrator (which sounds like it's Leslie Nielsen, so this clip was likely included in some TV special), it was actually a sketch on The Jack Benny Program.  No matter, it's just as funny regardless.

https://www.youtube.com/watch?v=iPQKS_bbJ8I