I first saw it as a kid during a visit to the WCRB radio station in Waltham, Massachusetts, to celebrate Beethoven's birthday ("Happy Birthday Ludwig") on the cake. I thought it was just about the most witty thing I'd ever seen!
The radio station, a classic station in more than one sense of the word, was known for giving away such colored bumper stickers as:
Oberon was a fairy
Soothe a savage breast today
Eschew obfuscation
Bach is beautiful
On Saturday Night the station "vice president", Richard L. Kaye, would play various humorous skits based off of topics which cropped up on Chase's calendar, a book that came out every year with topical calendar dates. Richard L. Kaye introduced the Hub (Boston area) to the Goons, Monty Python albums, I'm Sorry I'll Read That Again, Beyond The Fringe, and many other of his obsessions. He was friends with a station manager in Cleveland, so sometimes they would trade each other's shows off and we learned to celebrate Hinckley Buzzard Day.