Thank-You Letter Of The Day

A little background from Wikipedia for the young or uninformed:

"Rowan & Martin's Laugh-In" is an American sketch comedy television program which ran from 1968 to 1973. It was hosted by comedians Dan Rowan and Dick Martin and was broadcast over NBC. Cast members included Lily Tomlin, Henry Gibson, Goldie Hawn, Arte Johnson, Ruth Buzzi, Jo Anne Worley, Richard Dawson and more. Recurring guest