From: utzoo!decvax!harpo!eagle!mhuxt!mhuxi!mhuxj!mhuxv!burl!sb1!ll1!ihldt!ixn5c!ihlpb!clark
Newsgroups: net.jokes
Title: Re: Riddle - (nf)
Article-I.D.: ihlpb.237
Posted: Sat Jan 15 10:00:33 1983
Received: Tue Jan 18 04:07:18 1983

#R:pyuxqq:-10900:ihlpb:5700003:  0:163
ihlpb!clark    Jan 15  9:42:00 1983

The way I heard it, the joke was told on a computer network a couple of
months ago, and was beaten to death by everyone offering "their" version
of the punchline.