The general form of this joke apparently goes back to at least the 1950s:<p><a href="http:&#x2F;&#x2F;boards.straightdope.com&#x2F;sdmb&#x2F;showthread.php?t=264228" rel="nofollow">http:&#x2F;&#x2F;boards.straightdope.com&#x2F;sdmb&#x2F;showthread.php?t=264228</a>