It's the 40th Anniversary of The Hitchhiker's Guide to the Galaxy
Well, the book, anyway. The radio program started the year before.
More episodes can be found here (scroll down).
And, of course, the TV show aired in 1981.
1984's INFOCOM game was a hoot:
Or, you can play the slightly snazzier 30th anniversary version over here. HINT:FEED THE DOG A SANDWICH. Trust me on this.
There was also that movie in 2005, but we won't speak of it. Well, except for TV Marvin's cameo: