Jimmy Fallon is doing some Tonight Shows from Los Angeles and on February 4, one of his guests is Carl Reiner. I'm sure one of the topics that will be covered is that this appearance will mean that Carl Reiner has appeared as a guest on The Tonight Show with every one of its permanent hosts: Steve Allen, Jack Paar, Johnny Carson, Jay Leno, Conan O'Brien and now Fallon. I believe he's said that he was even on with Ernie Kovacs, who was the regular Monday-Tuesday host for a brief period at the end of the Steve Allen era.
I don't think there is anyone else who can claim appearances with Steve, Jack, Johnny, Jay, Conan and Jimmy. There are probably several, most of them now deceased, who were on with the first four. I'm thinking Jonathan Winters…maybe Jerry Lewis or Buddy Hackett or Tony Bennett. Was Steve Lawrence ever on with Jay? I doubt Betty White appeared with more than three of these gents, more likely two. And I don't think there's anyone who got five. Truly, Carl Reiner is the King of All Tonight Show Guests. Are you as impressed as I am?