In honor of David Letterman's retirement and his recent Late Show farewell---which I thought was rather dull---(I've always been a Leno fan)---I have made a list of videos featuring other Late Night hosts from the past making guest appearances on other sitcoms. These are all great classic episodes and I hope you will enjoy them:


JOHNNY CARSON

The Jack Benny Program - 1955 (short clip) (https://www.youtube.com/watch?v=mUd1-_91YTk)

The Jack Benny Program 1962 (https://archive.org/details/JohnnyCarsonAsGuest)

The Mary Tyler Moore Show - Mary's Big Party (https://www.youtube.com/watch?v=_5VhK4its8Q)

Here's Lucy - Lucy and Johnny Carson (http://www.hulu.com/watch/368034)

Cheers - Heeere's Cliffy! (http://www.hulu.com/watch/619902#i0,p20,s10,d0)


Others


Here's Lucy - Lucy And Joan Rivers Do Jury Duty - Part 1 (https://www.youtube.com/watch?v=w1Ceqgod1jI) Part 2 (https://www.youtube.com/watch?v=_ILKl2nCynQ)

Laverne & Shirley - The Feminine Mistake (with Jay Leno) (https://www.youtube.com/watch?v=_ILKl2nCynQ)

Mork & Mindy - Mork Goes Erk (with David Letterman) (https://www.youtube.com/watch?v=ULFSIoYqdCg)

Johnny Carson appeared in the 1964 movie Looking For Love starring Connie Francis.

Jay Leno had a large role in the 1978 movie American Hot Wax starring Tim McIntire as Alan Freed.