The runaway success of Rowan & Martin's Laugh-In prompted NBC to commission a daytime spin-off series. Sad to say, Letters to Laugh-In lasted just 3 months on the air.
Letters featured some of the familiar regulars from the primetime show, including Jo Ann Worley, co-host Dan Rowan, and, serving as both MC & announcer, Gary Owens. Scope out this sample episode, which can also be found at Saturday Morning Archives.
Silly, yes, but perhaps a little too over the top for daytime audiences. I never saw the show, so there's no rating.