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From: ark@rabbit.UUCP (Andrew Koenig)
Newsgroups: net.jokes
Subject: those who can, do
Message-ID: <2810@rabbit.UUCP>
Date: Sun, 20-May-84 21:31:26 EDT
Article-I.D.: rabbit.2810
Posted: Sun May 20 21:31:26 1984
Date-Received: Mon, 21-May-84 06:24:14 EDT
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 8

Those who can, do.
Those who can't, teach.
Those who can't teach, teach education.

The above is my favorite version of this joke, because the third
line follows so logically from the first two.  The tough question:
what do those who can't teach education do?  Do they teach education
teachers?  Surely there must be a funnier answer than that.